I think one of the best ways music has been used at the park is the old Space Mountain music. When I think of Disneyland music, that rocking song would so be the theme. I had a music file of the beginning of it on my computer some years back and I'd listen to it before I went to DL to get me in the mood. I am hoping when they re-open it, it will still have similar music during the ride.
Also, the Tarzan tree thing has some great music too. It certainly adds to the atmosphere.