We have "Man in the Middle" on our ShoreGrass cd, and I got in touch with Harley Campbell about permission. He told me that the owner of the publishing to that song is:

Paul Craft
Paul Craft Music
401 Bowling Avenue #62
Nashville, TN 37205
(615) 292-9788

After contacting them, I was referred to heath.hartzog@copyright.net for licensing contracts. This all happened in 2001, so I don't know if any of the addresses are still valid.

Harley, by the way, was very nice, and lived at the time in Trumansburg, NY. In fact, he found me, after hearing that I had been asking around about how to contact him! Network, network, network...

Good luck. It's a great song!