Dragonspyre has the best walking around music. Mooshu has the best battle music. Kroc comes in second in both catagories. Marley is ..well.. british and Wizard city kinda puts me to sleep.
It would be neat if we can choose which music we want to play as we adventure and fight.
You can... go to options and turn off the music... open your chosen media player and put on your favorite music... there you go, you chose the music you play as you are doing whatever.
I think he meant changing the music without going outside the game, but yeah that would work too if you could download the wizard101 BGMs. IMO the music that stood out to me was: Mooshu, for its peaceful and serene melodies, and Dragonsypre, for its music having that climatic feel to it. Can't wait to hear Grizzleheim's BGM. :-)