The medley, "I Gotta Go Now (Up on the Floor)/Funky Broadway," opens with climbing organ and horn lines and a funky drumbeat as the group sings, "I gotta go now," and it just gets funkier from there.

The funky farewell number from a rare concert recording of Sly and the Family Stone, from 1967, shows how playful the group was in their early days.The medley, “I Gotta Go Now (Up on the Floor ...