Where the well known version of a song is a cover

I forgot to mention that the Chad Mitchell Trio’s The Marvelous Toy is a cover of Tom Paxton’s.

I didn’t know anyone had done “Marvelous Toy” except Paxton. Well, and my father when I was a kid, but he never recorded it.

He also had a cover of Traffic’s “Feelin’ Alright” that I hear more often on the radio.

Bobby Vee recorded a tribute album to Buddy Holly in 1963 with some of the Crickets.

There was a pretty famous version recorded by the Irish Rovers. The first version I heard was by them. I didn’t know Tom Paxton had written it, until this thread.

Someone once made an instructional video for programming an analog computer that used the Irish Rovers version of the song as an intro.