A little bit of music to set the mood is essential at the opening of an audiobook. At the start and end of each podcast chapter of my fantasy novel Union of Renegades, there is music in the background. It's a piece called Morpheus Calls composed by Pierre Gerwig Langer that I licensed from Shockwave-Sound.com.
Unfortunately only a few seconds of this epic music are included in the podcasts, so I thought I would share the whole composition here. It's only a little over a minute long, but it driving aggressive beat and choral elements really bring to mind adventure and danger.
To listen to the audiobook that this sets the mood for, please go to the free fantasy podcast page.