Hey everyone :)
https://skyrim.nexusmods.com/downloads/file.php?id=1118
I've been using this for a while now and this music mod is just great. It fits incredibly well with Skyrim imo, adding a lot of atmosphere especially to dungeons. It has music for exploring at day/night, towns, big cities and inns; they all fit very very well. It has some combat music as well which I find very nice since vanilla music gets a little repetitive at times.
Of course it's a matter of taste but you can always go back so all should be good.
There is a download link with the mp3-files at the description too.