"Now there is no taboo; everything is allowed. But one cannot simply go back to tonality, it’s not the way. We must find a way of neither going back nor continuing the avant-garde. I am in a prison: one wall is the avant-garde, the other wall is the past, and I want to escape." György Ligeti
This is what you get in new music: Klara Lewis, The Conformists, Mazozma, Robert Crouch, Ryan Huber, Tim Hecker and loads more.
As for the old: Carl Stalling, Aranos, John Fahey (on electric guitar), The Friction Quartet and György Ligeti who has been regarded as "one of the most important avant-garde composers in the latter half of the twentieth century". As a commemoration of sorts to his death June 12th, 2006 we play “Requiem” composed in 1962.