Music of India I started studying North Indian vocal music back in the early 80's, first with Dr. Tapan Kumar Bhattacharyya, and after Dr. B moved to Chicago, for many years with Shri Narenrda Datar. I've always found the music beautiful, and I wanted the experience of confronting a highly developed system of classical music that had evolved along completely different lines than the European tradition. But even on the humbler level of musicianship, this was true. I am eternally grateful to my teachers and friends in this music who helped me to open these doors and, perhaps unbeknownst to them, to use myself as a guinea-pig in my own crazy experiment.
Indian music uses a drone.
I find that the drone is generally a very useful device for intonation, learning different sorts of scales, and so on. Besides, drones are known all over the world, from Scotland to Central Asia. The fundamental pitch is a around a b-flat, and the CD consists of a single track, around 74 minutes long. It you are interested, I can get you a copy, cheap. I can also send you a bunch of exercises, twenty-five pentatonic scales, and other cool stuff you can sing over the drone.