I don't know what Cinco De Mayo is but I don't think it's really a polka. It could be with the right arrangement, I guess.
I guess for me it sounds out of place on the album. It would have fit better on LONELY BULL. It doesn't have the same "band" sound that the rest of the album does. And, when I think polka, I think Myron Floren.What's wrong with Peanuts??? Everyone should love a good polka! Besides, it's the only one in the TJB songbook.