A prepared-piano is a piano whose sound is modified by placing objects in or around the strings.
While composer John Cage coined the term “prepared piano” and wrote its most notable repertoire, there are many other examples of the technique. Some go to incredible lengths!
In Le piège de Méduse, composer Erik Satie asks the player to insert pieces of paper into the strings to simulate the mechanical sound of a monkey puppet.
Stephen Scott, composer and professor at Colorado College creates intricate bowed piano pieces that require elaborate choreography to perform. A number of universities have posted their newly formed bowed-piano ensembles playing this very work: Entrada.