does the adventure involve a summoning? Cause I haven't played it. And "Awaken" should be reserved for the big stuff. If there is a summoning work up to it with less blatant. I'd recommend running two instances of your music player with the background tracks in one and "Awaken" paused in the second. That way you can quickly drop the volume of the background stuff and kick your Boss Fight Arrives music up over it on command rather than a timer.
Go with all the heavy, tense, doom-and-gloom metal for the beginning of the fight, but when the tide turns and the PCs start to whup some serious ass, bust out Nazareth's "Hair of the Dog" and let the baddie know that NOW he's messing with a son of a bitch!