Music: Records

RecordsnMUSICnby Robert R. ReiliynBohuslav Martinu's music is undergoingna recording renaissance, thanksnmainly to Supraphon. the Czech recordncompany whose discs are generallynavailable in the larger classical outletsnin major American cities. Supraphonnhas recently issued a newly recorded setnof Martinu's six symphonies (played bynthe Czech Philharmonic Orchestranunder conductor Vaclav Neumann!.nRCA Gold . . .