That´s a great topic, I also like the music parts a lot. Some of my favourites are
-Reese driving the driver´s ed car through the obstacle course (music: In to Deep)
- Of course the clown fight at the end of "Lois´birthday". It´s so hilarious when they´re fighting and in the background you can hear a very romantic music (You decorated my life). The great thing about the music is not only that it makes the scene funnier, but that you realize that Lois is pretty touched.
-When the boys use their slingshot to throw disgusting things on people (song: Tune in). What would that scene have been withought music?
These are only a few now, but there are just too many great music scenes to mention them all.