Outsider music: classics of American classical (53) - John Cage - Piano Concerto (1951) John Cage: Concerto for Prepared Piano and Chamber Orchestra (1950/1951) Some hate him, some love him, some consider him a fool, some a genius. In short, hardly in the history of music has a composer been so divisive. He was certainly one of the most important musical figures of the 20th century. Ladies and gentlemen: Giovanni Gabbia!