At first, I thought this was a goof of some sort. But after Googling "Black Rodeo," I found out this was an actual documentary made in 1972 about a rodeo held in the middle of Harlem in 1971. According to IMDB, it isn't available on video, which sucks, because I'd kill for a copy.
I guess until someone releases the film on DVD, we'll hafta settle for the trailer: