Echoing both John Cage and Alexander Calder , Earle Brown developed in the early 1950s graphic notation that encouraged both aleatory and improvisatory techniques. Folio (1952–53) is actually six compositions in which the performer is instructed to vary the duration, pitch, and rhythm. 25 Pages (1953) is designed to be played by as many as twenty-five pianists, reading the music pages in any desired order and playing the notes upside down or right-side up. Brown's Available...