I got interested in the idea of music that could make itself, in a sense, in the mid 1960s really, when I first heard composers like Terry Riley, and when I first started playing with tape recorders. ↗
We were gradually playing larger venues and in the early days PA systems were kind of non-existent. So to play loud, we had to use louder equipment. The PA systems back then didn't mic the instruments - only the vocals. ↗