And really this is not much new in them, there are precedents for all of it in earlier eras.
SJG
The music of Gurdjieff - De Hartmann (I think this will have similarity to Erik Satie and Claude Debussy, author in the first mentioned book on this thread wrote about Gurdjieff and did her dissertation on his music with Thomas de Hartmann www.youtube.com/watch?v=dwvGGZxaOEo&list=PL20IcBUGhOc1ZRSyFpy2n2eaRluM0mGVr