Avantgarde, real buddhist music ?

[Aemilius]

My personal experience is that composers like Karlheinz Sockhausen, John Cage, György Ligeti, Penderezky, Iannis Xenakis, Luigi Nono, etc... have something transcendental in their music, and I would say that there is something of buddha-dharma in their music. Whether they attach to it the name "buddhism" or not is beside the point altogether.
See for example the Helicopter String Quartet of Stockhausen.

with best wishes
Ae