[Cowboy Bob]

wore brown makeup and a wig in 1980 to look like a black rapper during a party

That's a LIE! There were no black rappers in 1980. The only rapper in this era was Debra Harry.

[mellow velo]

The Sugar Hill Gang's Rapper's Delight came out in '79. I saw them live back in my college days. They performed the song 3 times during the show. LOL