I just ran across a review of "This is your Brain on Music", by Daniel Levitin, 2007.-He states: The perception of pitch, tempo, the emotions invoked by a piece of music and the lyrics of a song all use different parts of the brain albeit simultaneously. -With 100 billion neurons and thousands of ways each can connect, can a human-desgned computer ever do this?-Levitin is a former rock musician, now professor at Stanford.