Automated Instrument
Certain instrument was created to be played automatically without the need of a human performer.
Drums
Like these Drums, they are placed in public spaces at The House on the Rock in Wiscosin.
The House on the Rock, originally opened in 1959,[2] is a complex of architecturally unique rooms, streets, gardens and shops designed by Alex Jordan, Jr. It is located north of Dodgeville, a city in Iowa County, south ofSpring Green, Wisconsin and is a regional tourist attraction. ( Source: Wikipedia)
You will find other automated instruments like the space organ created by Thomas Kupch