It’s hard to preserve the works of Indian classical music maestros. That’s because classical music here follows an oral tradition. The teacher shows how a composition is to be sung; the pupil catches. That’s how lessons, ideas, compositions flow from one generation to the next. It’s a system that has worked for ages. But there’s one drawback. Song notations are rare; their availability scarce. Archiving is absent. A good part of our musical heritage is lost. For ever.