I love the music in Melolune, its very relaxing and soothing to listen to, even the "action" music. I can't pick a fav track cause I like them all, but some of them would be the Victory music when you win a battle, the battle music itself (Ultimate Battle), when you're walking through the Leeble village, and most cool, is the music when you're going through the swamp.
I seriously cannot get it out of my head that the swamp music in Melolune and the Rigor Mormist "fog" music in PVZ are VERY similar. It always reminds me of one when I'm listening to the other lol
So, what's your favourite bit of music?