"In January this year (1975) I had an accident. I was not seriously hurt, but I was confined to bed in a stiff and static position. My friend Judy Nylon visited me and brought me a record of 18th century harp music. After she had gone, and with some considerable difficulty, I put on the record. Having laid down, I realized that the amplifier was set at an extremely low level, and that one channel of the stereo had failed completely. Since I hadn't the energy to get up and improve matters, the record played on almost inaudibly. This presented what was for me a new way of hearing music — as part of the ambience of the environment just as the colour of the light and the sound of the rain were parts of the ambience. It is for this reason that I suggested listening to the piece at comparatively low levels, even to the extent that it frequently falls below the threshold of audibility."
Obscure Records 1975