I've been wondering why it is music gets old. New music teases your mind with wacky sounds in familiar frameworks like the rock and roll beat. If you listen to a song enough times, the interest fades, in a process I can only assume is biophysically akin to memorizing something. I wish someone would take a bunch of people and look at what their brains do the first time they hear some song, and what they do after they've listened to it five times a day for a month or so. But then again, I don't have an MRI machine. Yet...