All of these stops are untuned percussion stops. While such stops date at least as far back as the early 16th century, in modern times they are found almost exclusively on theatre organs, of which they are an essential part. They are generally constructed of the actual instrument of the same, with an electric or pneumatic mechanism for striking the instrument. When they appear as a stop, they sound (the same) on every note of the keyboard. They may also be actuated by a special piston.

See also Bird Whistle, Donner, Drums, Pauke, Zimbelstern.

Tuned percussions include Carillon, Celesta, Chimes, Chrysoglott, Cloches, Glockenspiel, Harp, Marimba, Marimba Harp, Orchestral Bells, Vibraphone, and Xylophone.

Bibliography