I like this one a lot. It seems like Tom and Jerry are often silent observers of the things going on around them until there's a song, and then, since there's music playing, they are unable to do much of anything else but sing. I think you're hard pressed to find a cartoon were there's a conversation between them that lasts more than a sentence. I wonder if one of the reasons to keep them so quiet is so it's easier to make non-english versions of the films for overseas use....
The music in this one is especially fun. I know there's some forum members here who could probably identify some of the songs....