After working with Nico and John Cale in The Velvet Underground, Lou Reed continued to be an active, diverse collaborator for the rest of his career. Whether employing his signature spindly guitar passages or his off-kilter vocal cool, his cameos cut across both genres and generations, spanning fellow icons (Bowie, Booker T., his wife Laurie Anderson) and modern hitmakers (The Killers, Gorillaz).