prepared piano
Noun
Meaning
prepared piano (plural prepared pianos)
(music) A piano that has had its sound altered by placing objects (called preparations) on or between the strings.
Examples
Amos performed solo each night on her iconic Bösendorfer piano, and on a prepared piano during "Bells for Her".
The scores for music for prepared piano specify the modifications, for example instructing the pianist to insert pieces of rubber, paper, metal screws, or washers in between the strings.