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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 unkilled 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 a youtube video showing some of his instruments and featuring a short interview.