I leave it on for a few weeks when a new expansion comes out, just to hear the new score. After that, when soloing, music is always off. To repetitive.
Same as Sweety. I try it to see what it sounds like for a few days and then off it goes. I do the same with every game I have played.
I always keep the music on but really wish there was more music or the music actually looped. I get bored of just environmental sounds. I really love all the music in the older content like Antonica. I would love it if there was more music in each zone like that.
I like all but the character select music. It could be good if it wasn't like twice the volume of the music in game. Some mornings I have to turn my sound off as it's too early for that much noise.
I keep the music on but I swapped out the combat music for custom music. When the game launched it had great combat music (maybe a little short) but it was much better than that adaptive combat music they put in later on.