Showing posts with label harmonics. Show all posts
Showing posts with label harmonics. Show all posts

Sunday, February 12, 2012

John Bischoff: Audio Combine, Modal/Bispectral Discoveries, Post-Human Futures

John Bischoff, Audio Combine
L   ocal color’ features synthetic bell-like tones, sustained tonal clusters, and computer-triggered acoustic bells struck in complementary patterns that are sometimes random, sometimes human-triggered, and combinations of both... It is enough to reference the idea of a tactus, but not enough to be [understood as] an organizing [meaning-generating/insuring] element.”
  — Audio Combine, liner notes, Ed Osborn, Brown Univ, 2011.
T he music comprising John Bischoff’s new CD ‘Audio Combine’, just released on New World Records, is beautiful, fascinating, thoroughly enjoyable. Philip Perkins’s engineering and production values are superb.

T he five tracks on the disc are diverse, representing Bischoff compositions from 2004 to mid-2011. The third track ‘Local Color’ evokes traditional chinese zhong bells, but also especially calls into question the ‘who’ of music performance [in asmuch as some of the bells are computer-triggered, randomly and deterministically, while others are played by Bischoff from his score] and other limits of performance identity [insofar as the bell modes and timbres evolve after the bell is struck—on the rim; on the bosses/nipples; on the wall; etc.—in aleatoric/random ways that the musician-computer can neither predict nor control]. Of course, all music emerges in less-than-predictable/controllable ways—just less obviously so than bells.


    [50-sec clip, John Bischoff, ‘Local Color’; (track 3), 2012, 1.4MB MP3]
T   he pieces were all recorded in live performance with minimal editing and no over-dubs. Philip Perkins recorded direct from Bischoff’s setup and also from three pairs of microphones placed at various points in the concert hall. The mix heard here switches between these four perspectives as the pieces are played. The distance and pace incorporated into the recordings from various mic positions give a clear sense of the space of the performance, and of the object-ness of the sounds. That space and our place within it become the final part of the ‘material’: when the listener has no fixed point of perspective, then the position from which the listening/understanding is done becomes one of the elements of counterpoint.”
  —  Audio Combine, liner notes, Ed Osborn, Brown Univ, 2011.
T here are a few excellent books that empirically measure the modal vibrations of bells... He & Fu, for example. And some books on bispectral analysis—mainly used today in aerospace engineering and vibration-management engineering of turbines and other structures. Useful to explore if you are a composer/performer wanting to know more about how to more reliably utilize distinctive bell harmonics in your work. Links to some of these at the bottom of this post.
Fu-He book, p. 276
[Modal Analysis, Fu & He, 2001, p. 276]

    [50-sec clip, Wang Yuanping & Hubei Chime Bells Orchestra, ‘竹枝词 (Zhu-zhi-ci) Bamboo-pole Love Poem’; (track 1), 1989, 1.5MB MP3]

T he substantial rhythmic independence of the parts in the ‘Local Color’ bell quartet is part of its distinctive Asian beauty. Because each bell projects its sound clearly, each individual bell can easily be heard over the rest of the bell ensemble, and yet the ensemble—the ‘community’ of bells—remains the primary subject. This is dissimilar from other voiced percussion like a timpani choir, performing a ‘programmatic’ role, where the effect of four or more timpani playing together is treated more as an ‘effect’ than as harmony. It is instead quartet ‘orchestration with Chinese characteristics’!

W ith computer-triggered sticking, the timing of the ring-down and the pitch-bend are the same, but the kinematic nuances of human left-hand/right-hand mallet or sticking patterns are gone. But the electromechanical linear actuators for the computer-controlled bells have their own kinematic constraints, in terms of speed of resetting for the next stroke, and so on. They have their own unique, finite kind of ‘embodiment’ just as we humans have ours, and we can hear this in these wonderful Bischoff compositions and this excellent recording of them being performed ‘live’.

A nd so the most amazing thing that we get from Bischoff’s mechatronic compositions like ‘Local Color’ is a vivid glimpse of robotic humanity and machine consciousness, revealed by the beater mechanics and linear actuators... something like an inversion of the ‘human-becoming-machine’ perspective of Ambrazevičius and Balsienė (link below): ‘machine-becoming-human’... a brilliant future of new expressive possibilities, including bionic accomodations for musicians with disabilities. Musical prosthetics? Sonnez les matines! / Din, dan, don!





J ohn Bischoff (b. 1949) is an early pioneer of live computer music. He is known for his solo constructions in real-time synthesis as well as his seminal work in computer network ensembles. Bischoff studied composition with Robert Moran, James Tenney, and Robert Ashley. He has been active in the experimental music scene in the San Francisco Bay Area for over 25 year as a composer, performer, teacher, and grassroots activist. His performances around the US include NEW MUSIC AMERICA festivals in 1981 (SF) and 1989 (NYC), Experimental Intermedia (NYC), Roulette Intermedium (NYC), and the Beyond Music Festival (LA). He has performed in Europe at the Festival d'Automne in Paris, Akademie der Künst in Berlin, Fylkingen in Stockholm, and TUBE in Munich. He was a founding member of the League of Automatic Music Composers (1978), considered to be the world's first Computer Network Band, and he co-authored an article on the League's music that appears in "Foundations of Computer Music" (MIT Press 1985). He was also a founding member of the network band The Hub with whom he performed and recorded from 1985 to 1996.
John Bischoff, Audio Combine


Sunday, December 5, 2010

Prepared Piano: Subtle Effects by Hacking DIY Nocks with Sugru® Silicone Rubber

Nocking points and tube applied to piano strings
S ometimes ‘less’ is ‘more’. For ‘prepared piano’, you don't necessarily need to throw all sorts of heavy hardware, and car keys, bolts, screws, weatherstripping, and other violent junk into your piano and treat your piano like a percussionist’s rubbish bin.

F or one thing, the piano suffers. For another thing, the sonic consequences are just too extreme, and draw the audience’s attention to the performer and to the outrageous thing the performer has done to the piano, and detract from the audience’s actually listening to the music that the prepared instrument makes. Sometimes, instead of a visual ‘spectacle’ or sonically ‘provocative stunt’, the comparatively subtle acoustic effect you want can be gotten just by inserting some tiny objects that are gentle to the piano and that can be as easy to apply and remove as, say, a mute on a violin or other stringed instrument is easy to apply and remove.

T he do-it-yourself widgets below don’t ‘mute’ anything though. They dramatically change the pitch of each string they are applied to—from a few tens of ‘cents’, up to as much as a major sixth.

A nd you can’t create this sort of note-by-note harmonic effect with Pianoteq® or other synths; those establish harmonic attributes globally, applying them across the entire keyboard, not note-by-note.

F irst get yourself some Sugru®. It comes in a wide variety of colors, not just the orange that appears in the pictures here.

N ext, get yourself some 5 mm OD brass tubing and 5 mm OD brass archery nocking points (see links below). Also get yourself some 22 AWG copper wire, or whatever convenient gauge is slightly smaller than the diameters of the various piano wires where you intend to place the nocks.

T hen with your Dremel® handtool fitted with an abrasive saw (circle disc), cut your brass tubing to the lengths you want.

I  have used tubing lengths from 30 mm to 70 mm to create weights ranging from 3 gm to 7 gm. For strings in the bass register, obviously you can use larger-diameter brass tubing.

E ach Allen Co (Broomfield CO) nocking point (Part No. 540) weighs about 400 mg when its lumen is filled with Sugru® silicone rubber.

N ext, cut one lengthwise slit in the side of each segment of brass tube with the Dremel® handtool.

C ut pieces of copper wire with a wire cutter or snips, about 2 cm longer than the length of each brass tube or nock. Use a needlenose pliers to put a crook or loop in one end of each wire, so you will be able to easily grasp the wire between your thumb and index finger, and so you will also have a loop by which to hang each piece up in a safe place while the Sugru® cures. Alternatively, you can get a piece of florists’ foam or styro at a hobby shop and stick the straight end of the copper wire into it after the nocks have been penetrated by the wire.

L ay all of the brass bits and archery nocking points and copper wires out on your worktable on a piece of plastic or a plastic kitchen cutting board. This will faciliate clean-up and prevent the Sugru® from smudging any surface you care about.

O pen a 5 gm sachet of Sugru®. Roll it around in your fingers for a few seconds. It has the consistency of soft modeling clay at this point.

Y ou can press the Sugru® into the lumen of a brass bit with your fingers and trowel it nice and even with an artists’ spatula.

T hen take a copper wire of the length appropriate to that brass bit and gently push the straight end of the wire lengthwise through the Sugru® in the center of the lumen. The copper wire adheres to the fresh Sugru® a little, but you can easily poke the wire through, so that a centimeter or so of bare wire sticks out beyond the end of the nock/tube. Hang the wire with the Sugru® nock/tube (or insert the straight into florists’ foam) in a safe place where it can remain undisturbed for at least 24 hours.

C ontinue, filling each of the brass bits and penetrating their centers with the copper wires. Set your collection of Sugru® piano nocks aside in a cupboard—someplace at about 20°C (68°F) and away from sunlight.

F or your convenience, make a 5 mm ball of Sugru® and set it aside in the same location with the rest. Wait at least 24 hours for the Sugru® to cure. Pick up the 5 mm Sugru® ball and squeeze it. If it is firm, then you know that the curing process is complete and it is okay to proceed with the next step.

T ake a razor blade or X-acto® knife and cut radially, directly down to the copper wire. Mount each in turn in a PanaVise® or other suitable holder and slice the silicone in the lumen lengthwise, to enable the nock/tube to slide onto a piano string. Then gently rotate the copper wire loop clockwise and anticlockwise 45 degrees or so, to release the wire’s surface from its attachment to the Sugru® silicone. Pull lengthwise to extract the copper wire out of the silicone rubber hole it’s been embedded in. Use your X-Acto® knife to trim any excess Sugru® from the slit or the ends of each nock/tube.

Slicing silicone in nock core with X-Acto knife
H ere is how the Sugru®-filled brass tubes and bow-hunting archery nocking points look:

5 mm OD brass tube filled with silicone
Allen 540 nocking point filled with silicone
A nd the picture at the top of this post is how they look when you push the nocks and tubes on, their slits going over the piano wires so that each piano wire is seated in the center, in the cylindrical ‘cast’ made by the copper wire.

O n notes that have 2 or three strings, if you apply a tube or nock to one of the strings, you will create a sound where the weighted string is significantly lower in pitch than its companion string(s). In the upper register, my 3 gm to 7 gm tubes make the notes sound like Chinese bronze bells with the nipple-like bosses.

Zhou Dynasty bronze bell with bosses
Y ou can slide the weight close to the middle of the string and it will mainly lower the fundamental and second harmonic of the string. If you move it nearer to the end of the string, it will lower the third and higher harmonics much more strongly.

I ’ve created a little Excel spreadsheet (link below), which helps you to calculate how much detuning you can expect as a function of changing the average mass of a string by adding weight to it. Obviously, this simple spreadsheet does not tell you anything about how the higher-order harmonics change, given that the weight is localized in a particular position on the string, not spread over its entire length.

P lease add comments below or email me to comment on your experiences with these Sugru® prepared-piano kluges.





Sunday, November 2, 2008

Weilerstein & Barnatan: Prepared Cello, Unexpected Microtonality

 Alisa Weilerstein Inon Barnatan
W    eilerstein showed that she certainly has the technique to emerge as one of the leading cellists of the next generation. She produced a consistently lavish tone and demonstrated remarkably assured technical facility... With nearly flawless passagework and intonation, the cellist provided some pretty thrilling playing.”
  —  Chicago Tribune.
B    arnatan … has an instinctive understanding of Schubert’s fragile, deep world... he obtained a hypnotic tone from the piano... he made sounds that might have won the approval of Schnabel himself.”
  —  The New Yorker.
Cellist Alisa Weilerstein and pianist Inon Barnatan performed a program of Kodály, Golijov, Chopin, and Beethoven on Saturday evening in Kansas City in a Friends of Chamber Music concert at the Folly Theater. The program allowed the audience a wonderful opportunity to experience each of the artists as soloists, as well as their special chemistry together. Each is a tremendously passionate, emotional interpreter; together, their responsiveness to each other was magical.

  • Beethoven: Sonata No. 5 in D Major, Op. 102, No. 2
  • Kodály: Sonata for solo cello, Op. 8
  • Chopin: Barcarolle in F-Sharp Major, Op. 60
  • Golijov: Omaramor
  • Chopin: Sonata for cello and piano, Op. 65
Alisa Weilerstein is the daughter of Donald Weilerstein, the founding first violinist of the Cleveland String Quartet. At 26, she has performed with top U.S. and European orchestras and has given recitals throughout the U.S. and Europe. Her festival performances (Spoleto, Aspen, Caramoor, Schleswig-Holstein,Verbier) have been well-received. Alisa is the recipient of an Avery Fisher Career Grant. (She is also a 2004 graduate in Russian History (Columbia University). This is something of a unique path for an artist of her caliber, one made accessible for her by the stature and acclaim that her parents have as musicians, in addition to her own performance ability from an early age. How many people have the option to pursue studies in another field—liberal arts, engineering, whatever—and not have the door to a career in music shut on them? Not many. It is wonderful to see Alisa make this dream happen!)

Inon Barnatan is an artist of the Chamber Music Society of Lincoln Center. He has performed with the San Francisco Symphony, the Aspen Music Festival, the Mostly Mozart Festival at Lincoln Center, Carnegie Hall, the Concertgebouw, Salla Verdi in Milan, the Royal Festival, and Wigmore Hall in London. In past seasons Barnatan has made his debut with the Israel Philharmonic, Netherlands Chamber Orchestra, Orchestre de las Suisse Romande, Jerusalem Symphony, and numerous other ensembles. He trained with Maria Curcio with additional coaching from Leon Fleisher, Radu Lupu, Richard Goode, Murray Perahia, Claude Frank, Menahem Pressler, and Christoph Eschenbach.

The performance last night was engaging throughout. But the Kodály sonata especially intrigued me. Not the ubiquitous Kodály Eastern-European folk music elements, nor the fact that this sonata is imbued with the milieu of 1915, composed as it was in the early days of WWI. Yes, it’s a very passionate piece, and is therefore a perfect vehicle to illustrate the range of Ms. Weilerstein’s extraordinary expressiveness. Alisa’s use of rubato and rhythmic flexibility renders the improvisatory character of Hungarian elements with style, energy, and elegance. Yes. But those are not the aspects that really intrigued me.

What intrigued me—Alisa revealing this piece to us as though we were hearing it for the first time—was to grasp Kodály’s use of classical sonata form here and—oh, what does it amount to?—to figure out whether our own expectations have any force or moral standing? whether we’re fated to struggle and struggle and eventually lose? What I mean is, sonata form is conventionally an epitome of Enlightenment rationality. But, in this piece, our expectations keep getting dashed. Struggle and lose. How does this happen? Why? I think it’s not enough to think in terms of Epstein’s concept of ‘structural downbeat’ or ‘structural accent’, or, say, E. T. Cone’s concept of ‘frame’. I think the ‘How’ goes well beyond the notes on the page and the nominal structural features that are there. Our anticipation—and how it gets dashed repeatedly—is bound up with the timbral changes and the scordatura and the metrical displacements that keep happening.

Op. 8 requires scordatura tuning, borrowing an instrumental practice of the 16th and 17th centuries. The timbral characteristics of the cello are altered by the detuning of strings, and the cello’s resonance takes on a mysterious, hollow, melancholy quality. The scordatura is indicated at the beginning of the movement, above the first bar. The notes are performed ‘as-written’, as if the instrument were tuned normally.

 Kodály Op. 8, I, mm. 21-25
The other characteristic element of this sonata is what I referred to as ‘metric displacements’, through which the repositioning of the beat continually generates a sensation of ever-present alternatives. Although written in 3/4, the beginning of the first movement up to m. 31 is marked by metric ambiguity caused by variable positioning of accents in each measure, so that our anxiety is heightened. The emphatic 4-note chords are a major source of the metric ambiguity—quasi-boundaries or pseudo downbeats. The metric slippage and preemption—the displacements—create a sense of pulse in a different part of the successive measures. It’s like structural accents, as discussed by Epstein (1995, p. 23-6). Even when we achieve a ‘stable’ measure, whose downbeat is strong enough to be believed, it cannot be trusted for long. The ‘exceptionalism’ is recurrent, pernicious … so emphatic that it’s inescapable. The exceptions become the rule rather than the exception. The metric ambiguity is one of the main elements lending (or permitting the performer to give—) an improvisatory feel to this sonata.

The first movement begins with two chords that are repeated emphatically as a feature of the first theme. Things progress in mm. 21-25 (the bars pictured above), but, dashing our expectations, a transition surprisingly drives instead in measure 31, to the beginning of a new thematic group. Once we get here, we naturally feel things should move toward some new harmonic center of this new (second) thematic group. But, again, our expectations are thwarted.

The slow, lamenting phrases have these rich ornamentations—offering some emotional solace, I suppose. But instead of solace, these make us feel still more ‘on-edge’.

The metric displacements can preoccupy a performer, but not Alisa. She preserves a ‘speaking’ style in each phrase—to which the paroxysmal rhythmic gestures are incidental, not dominant. I imagine Kodaly’s rhythms and phrasing are somehow descended from the inflections of the Hungarian language. Weilerstein ably contours her phrasing, through agogic and rubato embellishments—in the lamenting sections especially. While Alisa may not be Hungarian, her sense of these inflections is admirable.

Beyond the interesting metric displacements, the scordatura intrigued me even more—how it sounds in the rapid technical passage work; and how it sounds in the context of the impressive Weilersteinian ardor.

It feels weird to place your fingers when the string(s) is (are) de-tuned, the scordatura does. This wasn’t written in C minor—in which case Kodaly could’ve either (a) left the lower two strings normally tuned and the fingerings on the upper two strings would’ve been higher by a half-step or (b) called for raised-tenor scordatura up-tuning of the D string and the A string, to E-flat and B-flat. No, he wrote it in B minor. And the open strings have a dramatically different timbre compared to stopped strings. The sound the bow produces at a given pressure and bowstick velocity is different from normal. (The hollow, scary quality of scordatura is why Saint-Saëns scored it in ‘Danse Macabre’—the discordant double, unstopped bowing in the scordatura-detuned first violins evokes a far-gone, unstoppable, decomposing, pell-mell ride to oblivion. Also, the departure from conventional tuning suggests some sort of irrevocable departure from the community of the living.)

Scordatura’s an aggressively soloistic thing—it cannot help but draw attention to the otherness of the scordatura-detuned instrument, in much the way that prepared piano draws extraordinary attention to the pianist. This is noticeable even in a solo piece like the Kodály sonata Op. 8…

Oh, the scordatura changes things—easy to say, but what does it mean really? Well, when you tune the string(s) down to lower pitch, the upper partials of the lower-pitched strings now become significantly lower in amplitude than the neighboring partials of the normally-tuned strings. And, if you do Fourier Transform analysis of a digital recording of it you see that, since the acoustic spectral energy tends to decrease with successive partials, the higher-pitched tones now tend to ‘mask’ the partials of the lower-pitched tones more than the reverse. So the lower-pitched strings now sound … long-dead. Cool effect, directly related to the acoustic physics of the harmonics/partials—and how (and anatomically where, in millimeters from the cochlear apex!) these superimposed sounds register in the nerve cells of the inner ear.

Have a look at the graph below, showing the frequencies of the harmonic spectrum for a bowed cello’s top string, A220 (solid lines), and as detuned to G196 (dashed lines)—and showing too the anatomical positions within the inner ear where those frequencies are sensed. A relatively large change in millimeters on the x-axis, this—especially for the higher partials. Look how much those shift downward (to the left in the plot), compared to the big spike, the fundamental frequency of the note, off to the far left. It doesn’t shift nearly so far when it’s detuned down to G196. We could do a similar graph for the cello’s detuned C and G strings, as called-for in the first movement of this sonata…

 Scordatura changes which haircells in cochlea of ear are affected by sound
And it’s not just the string by itself. It’s the change in the Chladni-plate resonances of the body—the radiation of the sound of the instrument. It’s the change in what the fingers are doing—the scordatura stopped string sounds muted (in general) compared to what the conventionally-tuned stopped string would sound like at the same pitch, because of the altered finger placement, the altered fingerboard coupling and the altered resonance acoustics. And it’s what the strings do in reaction to the bowhair, under the lesser tension after the strings have been scordatura-detuned. More weight of bow against the detuned string digs deeper than normal, starts up bigger amplitude vibrations quicker than normal. Bow speed that you are accustomed to now microtonally ‘pitch-bends’ on the detuned string many cents different than you expect. The note on the page, that’s not the half of it!

The scordatura-perturbed fine motor control of the hand muscles—and the disruption of the mind-body imaging of the fingerboard and its relation to the pitches—add yet another dimension (for the performer; not for a listener). The note on the page and the placement of your fingers no longer produce the note that your mind expects to hear. It’s tremendously disturbing to people with perfect pitch. But it’s disorienting to almost every performer. In fact, a friend of mine in Minnesota once said she couldn’t possibly play scordatura—it was too ‘painful’.

Conventional wisdom has it that the Kodály sonata in B-minor has the cellist de-tune the two lower strings by a half-step from C to B and G to F#, respectively, to enable open-string sonority for the recurring 4-note B-minor chords (bottom three notes are then open strings, with the scordatura arranged this way; only one finger down on top A-string) and to put the hand in first-position and make some of the passages easier to play. This ‘lowered-bass’ tuning, B-F#-D-A, down a half-step on each of the two lower strings is very different from the ‘raised-base’ tuning (up whole-step) that’s occasionally used with violin.

To hear Alisa Weilerstein play this is to realize that there are other timbral and gestural reasons to do the scordatura. The breadth of the 4-note chords forces you to attack the detuned low (B) string and quickly roll to the F# and D string together. The bowstick speed over that bottom string gives a forlorn, microtonally-bending B. This effect would be there, had Kodaly written it in C minor, but the effect would not be as pronounced as it is with the low B.

And besides that, with the open F#, etc., the string players among us just sense the different double-stops that are available, even if the composition turns out not to call for them. Sense where vibrato will not be. You don’t have to be up there performing it; you sense these things just sitting in your seat in the audience listening. It’s this pervasive, latent intuition of ‘possibilities’ now opened, of possibilities foreclosed—of unhingedness, of all bets now being ‘off’. And it seems implausible that Kodály would not have found all of those effects and rationales interesting and supportive—not just the nominal ‘detune the lower two strings, to enable open-string, tonic B-minor’ one. On the eve of WWI, all bets were definitely off…

Scordatura does appear in Bach’s ‘Six Suites’ for solo cello; many other Baroque pieces, too. In the Bach Suite No. 5, the discant string is tuned down one whole tone, from A to G. The cello in George Crumb’s ‘Vox Balaenae’ (for electric flute, electric cello, and electric piano) calls for detuning from C-G-D-A to B-F#-D#-A, which makes the B major last movement that much more sonorous, much like the Kodály.

Probably the weirdest and most symbolically over-the-top is Biber’s Sonata XI (The Resurrection of Christ), calling for detuning the G-D-A-E violin strings to G-G-D-D octaves and switching the two inner strings between the bridge and tailpiece, to make the sign of the cross. The D string moves into the position of the A string and vice versa! I don’t know of anything quite this strange in the cello literature, though.

 Biber, Scordatura Gone Wild
The ‘other-worldly’ impact of scordatura on the performer is both visual as well as registral/timbral/aural. As mentioned above, the ‘normal’ sight-sound intuitions are thrown out-of-kilter by detuning the string(s). Since the notated music you see now bears only a tenuous relationship to what you hear, you experience a profound loss—a sense of alienation. I try it on my violin, and the psychological effect can be hypnotic … if you take it further, do we get a detachment from the self; a sort of ‘dissociation’ experience? Very weird anyhow, the visual disorientation and eyes and ears ‘lying’ to each other. I wonder whether scordatura matters to folk fiddlers who don’t read music…

Curiously, out of the detuning and disrupted sight-sound relationships come these beautiful pitch-bent microtonal pitch anomalies. The fingers go where they’re told, but not quite. We get circumstantial microtonal pitch shifts, not just the different timbre associated with the detuned strings. And we get big differences from performer to performer, owing to underlying neurophysiologic differences between individuals maybe?

 Kodály Op. 8, I, mm. 1 - 22
    [50-sec clip, Janoš Starker, Kodály Op. 8, ‘Allegro maestoso ma appassionato’, 1.2MB MP3]


    [50-sec clip, Xavier Phillips, Kodály Op. 8, ‘Allegro maestoso ma appassionato’, 1.2MB MP3]


    [50-sec clip, Roel Dieltiens, Kodály Op. 8, ‘Allegro maestoso ma appassionato’, 1.2MB MP3]

How did I get on this peculiar path—microtonality via scordatura—with Weilerstein and cello and Kodály? Well, Ted Mook’s concert of microtonal cello compositions by Ezra Sims and Daniel Rothman occurred a couple of weeks ago (16-OCT-2008) at Roulette in New York. ‘Sensitized’ to microtonality in this way, it’s not much of a ‘stretch’ to start hearing interesting microtonal features in cello pieces that are not, on the face of them, overtly microtonal—like Weilerstein’s Kodály. Not actively looking for microtonal features, but nonetheless finding some. Thanks for your interest in this topic. Please feel free to comment or email me about microtonality caused by circumstantial or biomechanical/technic pragmatics that you happen to notice in compositions that are not explicitly scored as ‘microtonal’ pieces per se. And please go and attend Alisa’s and Inon’s concerts whenever you get a chance.

T    he notes and groups you ornament ... are, I think, best always performed with a glissando or portamento. This applies even when some notes will be detached clearly from the group.”
  —  Kodály Zoltán, Pentatonicism 1970, p. 239.

Y    ou have to figure out what string players can do. It’s interesting when the instrumentality has been radically shifted. I love collisions. I hate cross-over, multi-culti—I prefer a colossal smash, where you get sparks that actually deliver something else, something surprising that the players could never have premeditated. The notion of musical possibilities defined by the instrument and by the playing—scordatura, for example—that’s of interest. But when the instrumentalist tells the composer what’s possible and what’s not, you usually don’t get the best results. An improviser is going to actually deliver that stuff all the time they play. That’s in the nature of music practice.”
  —  Jon Rose, The Relative Violins, ‘Johannes Rosenberg: Violin Music in the Age of Shopping’.