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 (CSN, who are sometimes joined by Neil Young as Crosby, Stills, Nash and Young [CSNY]); and CPR. Crosby has been inducted into the Rock and Roll Hall of Fame twice: once for his work in The Byrds and once for his work with CSN.