(Note: As this is an old post, several of the external links are no longer operative or point the same content they did in 2005)
Not movie music, maybe, but definitely cartoon music.
Tonight I was driving down a dark country road when Franz Liszt's Hungarian Rhapsody #2 came on the radio. That's a classic that—I have no doubt whatsoever— I was introduced to by way of cartoons. It starts off so somber in tone, but by the end you feel like running around like a nut—like a kid. Every phrase of that piece has appeared in a cartoon in contexts ranging from funeral marches to bullfights to French Can-Can girls raising their skirts.
The particular recording I heard was conducted by Kurt Masur, with the Leipzig Gewandhaus Orchestra on Phillips. The bass strings were killer!