After a 1975 car accident, Brian Eno was left bedridden for several months. Judy Nylon had turned on the stereo for him, but the volume was too low for him to really hear the music. Unable to move to turn up the volume, he began to realize the music could serve as a part of the atmosphere, blending with other sounds. This realization led to an obsession with ambience, resulting in a ten-volume series of experimental ambient music.
Tuned In, Turned Up 