A relatively recent advancing is the prepared piano, which is passed down in contemporary art music. A prepared piano is a standard grand piano which beat had objects placed inside it before a performance in line to alter its sound, or which has had its mechanism changed in some way. The scores for rock for prepared piano often instruct the pianist to insert pieces of rubber or cramped pieces of ingot (screws or washers) in between the strings. These added items either mute the strings or erect awesome vibrating sounds.

The extra keys are added primarily for increased resonance from the associated strings; that is, they vibrate sympathetically with other strings whenever the damper pedal is depressed and thus give a fuller tone. Only a very small cipher of works composed for piano actually good these notes. Augmented recently, the Stuart and Sons company has-been also manufactured extended-range pianos. On their instruments, the elbowroom is extended both down the bass to F0 and up the treble to F8 for a Piano Lamps full eight octaves. The extra keys are the same as the other keys in appearance.