His collaborations rank as some of the most successful in music history, and as a touring musician he performed with hundreds of notable artists. He recorded 33 albums and at least 430 songs. He wrote "Delta Lady" recorded by Joe Cocker, and organized and performed with Cocker's "Mad Dogs and Englishmen" tour in 1970. His "A Song for You" which was named to the Grammy Hall of Fame in 2018, has been recorded by more than 200 artists, and his song "This Masquerade" by more than 75.