[Students] they did the sonic meditations, I would observe them in their ensembles, and the ensembles improved incredibly. So I knew I had something to do and something to say.

All the way from the first thing that I can remember, like our Victrola - a wind-up record player - and my grandfather's crystal radio, and my father's shortwave radio.

Those people who don't have any voluntary control, or hands, can work with the physical movement that they can do - whatever voluntary movement they have, even the slightest .

Maybe I'll start from the initial idea, what motivated me to do that. In 1953, I had access to a tape recorder. Tape recorders were not widely available. There was no cassette tape back then. It was a Sears Roebuck tape machine. I put a microphone in the window and recorded the ambience.

The sound that I play is delayed, it's modified, and it's modulated. It's an intelligent system; it's happening now.

After a long section of the glass playing, you'll hear an instrumental sound emerge from some undisclosed location. There'll be a lot of mystery about the sound, I think.

That's software in the States that I helped to develop. It enables people with disabilities to improvise.