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Created by Andy Thurlow the Anarchestra is a set of over 200 autodidactic instruments. The instruments are set up as an interactive art installation allowing play by the public focusing on allowing unskilled people to play the instruments. The majority of the instruments are tuned to A minor, allowing a key that has few dissonant notes.

The music made by this ensemble can be heard here-
https://anarchestra.bandcamp.com/

Here is the Anarchestra blog which contains a wealth of photographs of the instruments.
https://anarchestra.wordpress.com/

A wealth of music played on the instruments of the ensemble is available here.
https://anarchestra.bandcamp.com

The Anarchestra youtube channel-
https://www.youtube.com/user/steveket/videos

Here is a youtube video showing Andy Thurlow some of his instruments and featuring a short interview.

Here is an unusual and much longer and in depth documentary.