I'm pretty fond of Draconian_Tower.ogg but I'm thoroughly enjoying most of the game's music. The forest music was easily the worst-- it was so typical side scroller music which isn't a bad thing but a bit disappointing. Sky tower probably has the best mix of music from the locations I've been to so far.
"There once was a boy who dreamed of being a hero. Who believed sincerely in the battle to banish darkness from a world of light... but light and darkness are equal... and where one exists so too must the other... and when the boy finally realized this he had taken the first step toward being a true hero."