For anyone who is semi-serious about adding music to movies it is worth looking at the SmartSound package. With this you do not need royalty cds. This program adds music made up out of soundblocks to your movie and even works out where to put the intro and outro sections so the music matches the video.
We use this on all our movies and its really fantastic. Adding a matched piece of music to a 5 minute scene takes about 30 seconds.
http://www.smartsound.com