Simon & Garfunkel were an American folk rock duo consisting of singer-songwriter Paul Simon and singer Art Garfunkel, their biggest hits—including "Bridge over Troubled Water" is a song by American music duo Simon & Garfunkel, produced  by the duo and who?
Bridge over Troubled Water (song):  Produced by the duo and Roy Halee, the song was released as the follow-up single to "The Boxer" in January 1970.
i don't know