In this one, Tom is conducting at the famous Hollywood Bowl. Jerry is nearby with his mouse-hole shaped just like the Bowl. He, too, comes out in tails and wants to conduct. Why doesn't this mouse ever mind his own business and leave Tom alone? He starts a lot of the trouble and yet he's supposed to be the "good guy?"
You could call this "Cat Concerto: Part Two" since it is the same theme as the 1946 T&J short in which the cat and the mouse both get highly involved in a symphony orchestra presentation.
Anyway, every move - deliberate or not - makes the orchestra continue to play the concert without skipping a beat. Much of it is very clever. There is much more to this than the Oscar-winning first film but it doesn't have the overall class and charm the first one had. However, strictly for gags, this one offers much more. Take your choice.