prepared piano preh-PAIRD pee-A-noe Your browser does not support the audio element. [ English ] Definition A piano that has been adjusted in certain ways so that the sound produced is altered. Usually this is done by placing objects between certain piano strings altering the loudness, pitch, and tone color. Prepared piano was developed by John Cage. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2016-06-06 20:28:26