So, Al Kooper decides to leave Blood, Sweat and Tears, but before he does he wonders if the group should do a cover of a little-known R&B song called "You've Made Me So Very Happy." David Clayton-Thomas joins the band, records the cover and it becomes a massive hit. "He picked it out to sing and left it behind," Clayton-Thomas later said. "The chart was already written for it and I liked the tune, and that was Al’s present to me."
