I don't know about you, but I'd have neve guessed that Sherman Hemsley was any kind of a prog guy. Yet he was.
In fact, back in 1999, Sherm recorded a full album with Jon Anderson of Yes. A full-on freakin' rock opera with all the lyrics contributed by Hemsley. Sadly, Festival of Dreams has never been released.
But George was also an early adopter of rap (or something kind of like it) as this 1980 single, "Ain't That a Kick" illustrates. You're welcome.
Oh, and he once ran an LSD lab in his basement. But that's another story entirely.