David Van Cortlandt Crosby (born August 14, 1941) is an American guitarist, singer, and songwriter. In addition to his solo career, he was a founding member of three bands: The Byrds, Crosby, Stills & Nash (who are sometimes augmented by Neil Young), and CPR. Crosby is a member of the Rock and Roll Hall of Fame for his work in The Byrds and CSN.