From National Public Radio:
The iPod of the Brain
by David Malakoff
March 14, 2005
Researchers at Dartmouth College find the "iPod of the brain." They've learned that the brain's auditory cortex, the part that handles information from our ears, holds on to musical memories. So even when that perky pop song isn't on the radio, you still hear it in your head.
For the NPR audio stream, click here.