"And on percussion, let's have a hand for BM Victor"

YouTube link. 

I think that's the brand of the tractor, which I've not seen here in the U.S. (Volvo would be the manufacturer); the video doesn't specify, but I think I identified it with some image searches.  The song is, of course, "Sweet Georgia Brown," from 1925, later made famous by the Harlem Globetrotters.

Via gbradley's ChocolateChipCookiesRock.