Does anyone know where the info about Johnny Mathis recording "Never Before, Never Again" for The Muppet Movie comes from? Also the specific anecdote about Jim thinking it would be funnier if Piggy sang it.
Michael added it in the first draft of the article almost 14 years ago, and it feels like the kind of thing that's common knowledge to us, but it's also pretty specific and something we should really cite. Especially in light of this (to the right) false claim from 2007's The Ultimate Book of Useless Information by Noel Botham.
Ask Henson, in all its obscurity, strikes again. This capture (dated Nov. 6, 2001), the latest traceable update before the page seemingly shut down, provides the answer; numbered 97 and copied here for those who don't wish to scroll or use Ctrl+F:
“Piggy never sang a duet with Johnny Mathis. The confusion, I think, is because Johnny Mathis did record the song "Never Before" that was played over Miss Piggy's dream sequence in THE MUPPET MOVIE, but Jim Henson decided that, as good Mathis was, it would be funnier if Miss Piggy actually sang it, so the Mathis version wasn't used in the film. However, Mathis did sing the song on the television special THE MUPPETS GO HOLLYWOOD (accompanied by Rowlf on the piano).” —Karen Falk — Archivist, The Jim Henson Company