You reach the vampire lord's castle after eradicating his kind. As you enter his throne room, you hear him playing a requiem for his fallen kind, and you can tell that he is warming up to do one thing, and one thing only. F*** you up to avenge his brethren. *Boss theme starts* roll for initiative.

Or at least that's what I was thinking of when writing this.

You get a click track along with the actual music, which might make it easier for looping the intro or something.