the Marx Brothers rule. I have a bunch of OTR You Bet Your Life mp3s and they are hilarious, even outside the context of their time period.
Horse Feathers is my personal Favorite.
Chico is an amazing musician. I don't know which movie it is, but there is one scene where I think he says it is gypsy piano (with violin)...I still remember back to when I first saw that as one of the best musical scenes I have seen on film.