The combat song is playing over and over even though no threats are around. The song started during the quest "The Battle for Solitude". I tried player.kill and reloading the latest save, as suggested by some forums, but nothing worked so far.
All you need is this console command:
After inserting this command the music slowly fades away. Unfortunately, if something else than Civil War quests caused it I'm afraid it might not work.
For me, saving and then quitting to desktop works, then when I log back in, it plays the normal "Peacetime" music.
Unfortunately... if you're stuck combat music is due to a dragon battle- it may never go away! After killing a dragon in Riverwood, all the dragon's remains will sometimes fall into the middle of town and make the main dragon impassible. My typical manner of cleaning up unwanted corpses is to open console and click on the corpse. When I see the ID code for the unwanted corpse (in this case- a huge dragon skeleton), once the console is focused on the target- I simply type : disable
It would appear, though... (much to my dismay) that this may cause the combat music to become permanent. Killing your character multiple times does not make it go away. Starting a new game on the same file, and then reloading your developed character doesn't make it go away either.
In case if it's the standard combat music that is stuck, use the following console command:
Source: discussion on Nexus Mods forum