[Help] Trying to find a specific album from my grandfather’s collection

Hey all, I lost my grandfather today and im trying to track down a specific record from his collection that meant a lot to me as a kid. It was one of my favorites and I really want to find a copy to keep with me. Unfortunately I don’t remember the band name or any songs, I just vaguely remember the cover art.

It was a cartoon/drawing style that was pretty colorful, and it showed the band backstage, or in some kind of pre-show green room. They were skeletons and either putting on or taking off their human skin like it was clothing or a costume. As a kid i assumed it was them getting ready for the show.

I’ve been searching all over and can’t find it, it was released somewhere between the mid/late 60s and early 90s, but I know that’s a broad range but its all i can think of.

Any help is greatly appreciated, thank you.