Robert Ashley's Music With Roots in the Aether (1975)
14 hours of video (.avi & realvideo) and audio (MP3) of Robert Ashley interviewing composers David Behrman, Philip Glass, Alvin Lucier, Gordon Mumma, Pauline Oliveros and Terry Riley. The pieces are broken down into one-hour interviews and one-hour live performances, all from 1975. Check out the Robert Ashley files: they're chilling. Very rarely seen since its filming.