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 ); and CPR. Crosby has been depicted as emblematic of the counterculture. Musically, he wrote or co-wrote Lady Friend, Why, and Eight Miles High with the Byrds and Guinnevere, Wooden Ships, Shadow Captain, and In My Dreams with Crosby, Stills & Nash. He wrote Almost Cut My Hair, and the title track Déjà Vu for Crosby, Stills, Nash & Young's 1970 debut. He is known for his use of alternate tuning, and jazz influence (notably on Eight Miles High, Wooden Ships, Déjà Vu and with his group 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.