Joe Cocker also made John Belushi famous - There was a new off-broadway stage show from National Lampoon called “Lemmings” - the producers were looking for someone who could imitate Joe Cocker - Belushi tried out and got the part, this was in 1973.
Belushi also did his imitation of Joe Cocker later on SNL - Cocker came out and joined him on stage. This was back in the good old days when SNL was worth watching, of course.
That was classic.