Funny you should mention that...when asked who he listens to, John Prine lists Dylan, Van Morrison, and Gordon Lightfoot - he also gives quite a nod to Kris Kristoferson, but as it was Kristoferson who gave him his break...
If you haven't seen the Library of Congress performance, you can see it at:
http://www.loc.gov/poetry/kooser-prine.html
Worth checking out!