If you need music for your book trailers or other projects, seriously check out Partners in Rhyme (clever name, don't you think?) for Royalty Free Music and Sound Effects
They have a really large selection, so take your time and you'll find what you're looking for. By the way, this is not a paid post.
royalty free music Partners in Rhyme
Book of the Month
Roses are Pink, Your Feet Really Stink by Diane deGroat.