High Quality Content by WIKIPEDIA articles! A theatre organ is a pipe organ originally designed specifically for imitation of an orchestra, but in latter years new designs have tended to be around some of the sounds and blends unique to the instrument itself. Theatre organs took the place of the orchestra when installed in a movie theatre during the heyday of silent films. Most theatre organs were modelled after the style originally devised by Robert Hope-Jones, which he called a "unit orchestra". Such instruments were typically built to provide the greatest possible variety of timbres with the fewest possible pipes, and often had pianos and other percussion instruments built in, as well as a variety of sound effects such as a siren.

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