Question: 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?
Sentence (from "The Boxer"): Produced by the duo and Roy Halee, it was released as the lead single from the album on March 21, 1969.
Relevant evidence: No