Who pioneered minimal music in the mid to late 1960s and performed in The Festival Dancing in Your Head? 
The Festival Dancing in Your Head:  Composers performed include Steve Reich, David Lang, Michael Gordon, John Adams, Arvo Pärt, György Ligeti, Martin Bresnick, Brian Ferneyhough, Annie Gosfield, John King, Phil Kline, Evan Ziporyn, Béla Bartók.
i don't know