The only cartoon guess I can see is The Tom and Jerry Show, but listening to the theme I'm doubtful.

[Kim, rab] Ooooh - y'know ... I think rab has picked up the right clue. Weren't there TWO different Tom & Jerry productions? Each with its own tune? Is this the Fred Quimby one?

[rab] I can only surmise that you're either not listening to the tune properly (doubtful) or listening to the "other" tune, because, as Chalks says, this is the tune to the Tom & Jerry cartoons from the unsurpassed Fred Quimby. Joint honours to rab and Chalky! Sing it now with me: "Pa-pa-pa paaah, paaah pah-pa paaah...."

[Kim] Nice rendition actually! Comparing it against http://www.tomandjerryonline.com/sounds/Tom_and_Jerry_theme.mp3 it's very clearly the one.