Thanks for the reply. I doubt it's PlaySound. It's been at least a few game-weeks after the Battle for Bruma, but whenever I cross into the area near the battle site, the sounds of battle abruptly start, and then abruptly stop when I'm far enough away again, as if the battle sound loop was somehow assigned to that area, but was never changed back (or removed). I've been poking around and it looks like it might be an issue with Sounds of Cyrodiil. I posted in that mod's thread.
Thanks!