*Also missing, doing anything nearly as clever as the mouse being like grizzly bear thing to play with the stereotype of insects and bats being creepy and evil.
cdza have a hypothesis: key changes increase the epicness of a song.
They have evidence*.
*I will grant you that this is more of a demonstration to illustrate a point. At best, it is, in isolation, anecdotal. But, it is fun, and unlike unproven, quack cures for cancer, this has almost no side effects.