Works of art that use a piano, organ, or keyboard

Works of art that use a piano :
 * Joseph Beuys, Infiltration homogen für Konzertflügel (Homogeneous Infiltration for Piano) (1966)
 * Phillip Corner, Piano Activities at Fluxus Internationale Festspiele Neuester Musik, Wiesbaden (1962): an art Fluxus happening performed by George Maciunas, Dick Higgins, Wolf Vostell, Benjamin Patterson, and Emmett Williams.