The enhanced e-book Gift by Andrea J. Buchanan is a young adult novel that incorporates original music with a graphic novel and journal format. Check out the Facebook page.
Booktrack is a company that creates soundtracks for books.
Read The Soundtrack of Our Books to learn how some authors are connecting music with their works.
Spotify is a tool for creating playlists you can share with others. The downside is that it involved a download. After downloading, you can create or download playlists.
Explore the author's letter writing challenge. Read Letter Writing Mix on Spotify to learn how music could be added to the experience. Listen to the play list. Write your own letter. She created a website for information and a Facebook for sharing.
Explore other examples of playlists to go with novel go to the Note Books blog.
Free Stock Music, Free Music Archive, Live Music Archive, a great place to fine music to connect with books. Also check 100 Online Sources for Free and Legal Music Downloads.
You can create music with tools like Garage Band. Use online tools like Musicshake.
Wikipedia has a great list of songs that retell a work of literature. Make a comparison.