Music & the Brain

I've been busy on the computer in the last two days looking for research about music and the brain. A friend of mine attended a lecture where the person talked about the effects of classical music vs pop music on rats - the classical rats completed mazes the best and when their brains were examined later, all the bits in their brain were 'beautiful' (don't really know how to describe that!) but the pop music rats became slower and slower at completing their mazes and their brains were a mess. Hmmmm... I like to see the research and find other research that backs it up so I've been busy googling for a while.
I'll post anything interesting that I find. So far, it seems that classical music is definitely beneficial - for maths, language, memory, relaxing etc. I did find one study that said that preterm babies put on weight better and were less agitated/lower heart rates when listening to classical music in the neo-natal units than babies who didn't have classical music. Kind of handy if you know someone who has a struggling premature baby.