By “superstars”, I mean singers that were solidly at the top of their game in their genre when the song was recorded.
Willie Nelson, Johnny Cash, Waylon Jennings and Kris Kristofferson performed The Highway Men.
Merle Haggard, Waylon Jennings, Charlie Pride, and David Allen Coe did Greatest Country and Western Song.
What other songs like these can you think of?
(They donts hayve ta bey country and weystern soungs.)