So far I've created an alternate save which lets me mess with commands and other things to try to fix this problem. Turns out there are two spots that aren't actually too far from one another, near the south-west gate by the Tournament area. At first I thought it was Flinkfeil who was triggering it so I killed him. It wasn't him. I've used noclip to look around and have found no creatures and no npcs stuck outside of the world. I've used detect animal and found nothing except for the pigs nearby.
I've drawn the areas where the music is triggered with red. It's a bit rough but it's as accurate as I could make it. I hope someone can help me identify what's causing this.
