Rick
I pasted this out of an article on the front page of The Daily Telegraph newspaper (this is a broad sheet not a tabloid) in the UK today. I am sure you probably know it anyway.
Someone listening to songs or tunes they enjoy experiences a release of dopamine, the hormone linked to reward and happiness. This association has led Prof Levitin, who worked with Stevie Wonder and the Grateful Dead, to claim to have discovered the "sex, drugs and rock 'n' roll" centre of the brain after collating research to be published this year.
The link to the full article:
http://www.telegraph.co.uk/news/main.../nmusic118.xml
If nothing else it's an entertaining read.
Chris