What is probably the best bet is to go to Amazon and look up all
the movie soundtracks and then cut and paste the lists, or
something similar. As an option, one could get hold of the DVD for
each episode, FFwd to the credits, and pull the music from there.
As a parting idea, once in a while a song will be included in a
movie where only a snippet is played and no credit is made for its
inclusion. (This from personal experience.) It is possible (though
not a certainty) that this may be the case with one or more of the
Star Wars episodes. One may have to watch the whole of each of the
movies and make a running talley. If push comes to shove and one
tries this, it is highly recommended that a the list of the incuded
music be pulled off from the end of the movie before viewing. It'll
make it a little easier to keep track....