The Disklavier is used as a “prepared piano” according to instructions for the Sonatas and Interludes by John Cage, and its playback is controlled by a computer program. Much of the music played by the Disklavier consists of fragments of the Sonatas and Interludes, recorded specifically for this composition. The Disklavier playback is accompanied by live, improvisatory piano performance in response to that playback.
This composition contains a wide dynamic range with many delicate sounds.
They are best perceived by listening with headphones.