I have been using this software to creat background music for my videos. A great piece of software. You can purchase additional themes as times goes on. A little pricey at around $200 plus additional themes are around $100 but I do like using it. Almost makes my video look good. Just thought I would through that in for anyone looking for some music software.
http://www.sonycreativesoftware.com/products/showproduct.asp?pid=1013