Chess
Marcel Duchamp already deserves a place on this site for his toilet-based artwork Fountain, which is one of my favourite pieces of art for how it so completely boils the piss of people who think that art should be endless copies of Michaelangelo's David.
Later in life Duchamp got into chess. Duchamp and John Cage (the surrealist composer) played a public match on a modified chessboard with photovoltaic cells under the squares. As they played, it activated or cut off the sounds coming live from musicians performing in the room, thus procedurally generating a piece of music.
This is now my headcanon for how Soundkind play chess.