In the last three decades or so music critics have frequently complained (or at least noted) that the arrival of the jet age and the fall of the Iron Curtain have pretty much erased the distinctly national characteristics of music making. Musicians and ensembles around the world, we are told, tend to make music in much the same "international" way regardless of whether they hail from Moscow, Prague, Paris, or New York.
To me the empirical basis of such claims remains elusive. Recordings of orchestral music from an earlier era suggest that styles of music making depend almost entirely on conductors. Conductors who were trained within the same geographical borders (e.g., Klemperer, Walter, Furtwangler, Strauss, Karajan) and worked with the same orchestras (e.g., the Vienna or the Berlin Philharmonic) interpreted the same compositions in ways which differed from one another so much as to make the idea of a 'national style of music making' vacuous at best. And when some of these conductors moved to other countries (e.g., Klemperer to London, Walter to New York) their ways of music making crossed the borders along with them. The only empirically meaningful difference between performances of, say, a Mozart symphony conducted by Bruno Walter in New York, Vienna, and Paris in the 1950s is that the standards of execution maintained by the French orchestra were abominably low, those of the Vienna orchestra barely adequate, and those of the New York orchestra were at the highest level.