I don't think these were used for piano, but there was an organ book music system that used a chain of cards: https://en.wikipedia.org/wiki/Book_music https://e

I don't think these were used for piano, but there was an organ book music system that used a chain of cards: https://en.wikipedia.org/wiki/Book_music https://en.wikipedia.org/wiki/Book_music Edit: some discussion here https://music.stackexchange.com/questions/7536/did-any-player-pianos-use-card-decks https://music.stackexchange.com/questions/7536/did-any-playe...