 After the Cosmic Rain, a Stanley Clark original from a Return to Forever lineup with Lenny White on drums. Stanley Clark. Lenny's one of those musicians that, like Chick, whatever he does, I know what he's going to do, and vice versa. Return to Forever was a true jazz rhythm section. The drummer from Return to Forever, Lenny White. We were a part of the generation that took the music that they had grown up with and flipped it.