You believe that playing or composing music is still unexplained?

"Changes in prefrontal activity during improvisation were accompanied by widespread activation of neocortical sensorimotor areas (that mediate the organization and execution of musical performance) as well as deactivation of limbic structures (that regulate motivation and emotional tone). This distributed neural pattern may provide a cognitive context that enables the emergence of spontaneous creative activity."

http://www.plosone.org/article/info:doi/10.1371/journal.pone.0001679

http://www.psmag.com/science-environment/the-musician-s-brain-4698/

http://www.youtube.com/watch?v=5GZFbF3Wk-g&feature=player_embedded