Peter -- W.A. Mathieu is a Sufi and a jazz pianist of sorts and a composer. He has studied Indian music and jazz. I have a couple of his books: The Listening Book (which has interesting exercises for any musician to do) and The Musical Life, which didn't grab me as much. His books are published by Shambala and he has recordings, too, none of which I have ever heard, not being a fan of either jazz or ragas. I do like the way he writes about music and some of his things to do. He also teaches, but I don't know where.