Saturday, July 21, 2012

Martin Stadtfeld: Inspired Runtime Indirection

Martin Stadtfeld, Wiesbaden Kurhaus, 19-JUL-2012
T   he Busoni transcription is] absorbed in itself, moving round itself, decidedly turned away from the world... brooding; Beethoven-ish.”
  — Hugo Riemann.

A   lthough Bach set verses from Luther’s ‘Nun komm, der Heiden Heiland’ nine times, many of the same Advent themes run through all the settings. Subtle nuances and theological allusions point to various verses of the chorale text, and the cantatas remain a starting point for the interpretation of the organ works.”
  — Anne Leahy, in Zager, p. 95.

M artin Stadtfeld’s performance of Mendelssohn’s Klavierkonzert Nr. 1 g-Moll op. 25 with Sir Neville Marriner and Academy of St. Martin in the Fields at the Rheingau Festival was exceptional—a young man’s composition, performed with a young person’s sensibilities and energy. It simply sang!

B ut Stadtfeld’s 4’30” encore (Ferruccio Busoni’s transcription of J.S. Bach’s BWV 659 ‘Nun komm, der Heiden Heiland’) revealed a maturity and grasp of life’s setbacks and aporias: it was teleological, driving purposefully toward its goal(s) with pragmatism and propensity toward acceptance, yet with an open-heartedness/open-mindedness that still has room for hope.

S tadtfeld’s left-hand is quiet... ‘reticent’, as recommended in the performance notes in the original Breitkopf & Härtel edition of Busoni... enabling his melodic right-hand to have the terse prominence it requires. The tenuto and agogic accenting in the right-hand, in turn, conveys motives that are… pregnant.

T he expectancy was such that Stadtfeld impressed us that he himself was discovering things as he went, even though he has performed this prelude many, many times in the past... ‘sehr ausdrucksvoll mit vollem Anschlag.’ Many notes—the touch he applied to them—were, to me, like variable values in a software module that were resolved and bound at Stadtfeld’s pre-concert preparation—at ‘compile-time,’ so to say. But there were equally many that are only resolved on a moment-by-moment basis during performance (runtime). The balance between these lent a tremendous liveliness and interest and vibrancy to the performance of this beautiful Busoni transcription.

I t is, for me, analogous to the difference in software between a layered design with subroutines and an object-oriented design with event-handler methods. The terseness of the left-hand is such that Stadtfeld expresses not a human resoluteness but instead a process in Nature, something that is immutable, like mortality; not at all deterministic, but inevitable in the sense that human wishes and intentions cannot change the outcome.

I n software engineering terms, the Busoni-Bach left-hand module is a ‘wrapper’ and encapsulates the right-hand module. The left-hand ‘service’ owns a set of ‘objects’ with ‘handlers’ that share the same state. State is possible to preserve across invocations as the figures recur over the 3 pages of this transcription. It lends nicely to cooperation through message passing communication. Stadtfeld’s multiple levels of runtime indirection... reveal the extent and fate of our wishing and desiring.

E ach object has three parts: a component implementation, an export interface, and an import interface. Export and import can be modeled with runtime constructs specifically designed for component wrapping and interface adaptation, such as interception techniques for runtime resolution. The trills, for example, amount to handshake interfaces between right-hand and left-hand parts.

L iabilities of interpretations that entail generous amounts of runtime indirection include (1) variation-point management [adding and binding variants at a late moment in time implies extra work for managing and implementing variation points] and (2) predictability [a large amount of variability makes it virtually impossible to test all combinations during rehearsal]. But the merits of ‘romantic,’ liberal runtime indirection include danger, surprise, and excitement of the sort we were thrilled by on hearing Stadtfeld’s inspired performance of this Busoni-Bach ‘Nun komm’ Zugabe. A tiny encore that emotionally surpassed the gifts of the excellent, larger concerto that preceded it. Bravo!

Feruccio BusoniIndirection
M   athematics is the heart and soul of music … Without question the bar, the rhythm, the proportion of the parts of a musical work and so on must all be measured … Notes and other signs are only tools in music, the heart and soul is the good proportion of melody and harmony. It is ridiculous to say that mathematics is not the heart and soul of music.”
  — Johann Mattheson, 1743, ‘Neu eröffnete musikalische Bibliothek’ 2:54.

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