hm, I played again (with your save),
and this time I tried the removemusic command.
that brought back the usual exploring track.
getting in fights seemed to either have zero effect on the music (which sometimes does happen with shorter fights),
or complete silence (apparently)
reloading didn't change to combat music though :/
if that problem first appeared with the "voice in the water" - quest,
did you check saves from before that point?
(yes, your posts suggested it, just want to make sure

)