Last night I started experimenting with Windows Movie Maker, a great way to make a free, decent book trailer. You can look for music at the Free Music Archive. Just be sure to properly attribute; that is, give credit where credit is due!
Not that I have a book trailer yet, but I’m working on it… Here’s something silly I put together, based on a video of my daughter:
Southern Bend Books 
Enjoyed the video of your daughter and the glasses. What a great idea to promote reading!
Thank you!