Love 20th Century experimental music and have 14 hours to spare? You’re in luck ! Long enshrined at the redoubtable Ubuweb, and available for purchase from Lovely Music in what I’d presume to be far superior quality, here’s the entire series of 7 films, each devoting a generous 2 hours to the composer, presented by composer Robert Ashley entitled Music With Roots in the Aether in YouTube form. Each film begins with a solid hour of unedited and consistently fascinating conversation in odd landscapes, frequently surrounded by people engaging in unrelated yet complementary activity leading into an hour of musical performance, most of which is solid wonderful-ness. One terrific example: See Alvin Lucier (as pictured above) performing Music For Solo Performer wherein his brainwaves are massively amplified through speakers attached to a battery of orchestral percussion instruments. Good times !
 
David Behrman

 
Philip Glass

 
Alvin Lucier

 
Gordon Mumma

 
Pauline Oliveros

 
Terry Riley

 
Robert Ashley