Here's a link to a
radio show about Bob Marley's 'No Woman No Cry' which runs for 20 minutes. Its followed by a discussion by a bunch of 'pointy heads' about Music and Songwriting.
Don't be put off by the fact that these guys are 'academics', they have some interesting things to say about music. It's only streaming audio (no download) and is only there for a couple of weeks more, but if you are interested its here
/intothemusic/
and click 'listen now' for the program of 20th October.
One good thing about music is that when it hits you, you feel no pain - Bob Marley