"Shine On You Crazy Diamond" is a nine-part Pink Floyd composition written by David Gilmour, Roger Waters, and Rick Wright. It appeared on Pink Floyd's 1975 concept album Wish You Were Here. Part II (Gilmour, Waters, Wright; from 3:54 to 6:27) begins with a four-note theme (B♭, F, G, E) (known informally as "Syd's theme") repeated throughout much of the entire section. This theme leads the harmony to C major (in comparison to the use of C minor in Part I). Mason starts his drumming and Waters his bass playing after the fourth playing of the four-note theme, which is the point where the riffs get into a fixed tempo, in 6/4 time. The chord leads back to G minor (as from Part I), followed by E♭ major and D major back to a coda from G minor. This part includes this solo by Gilmour.