WiseGuys has the John Prine presale passcode: For a little while you can order your concert tickets before anyone else!!! 
Now is the time to order your tickets – before they go onsale and sell out! Purchase your tickets now to see John Prine in Nashville!
Here is what we know about the John Prine concert:
John Prine
Ryman Auditorium
Nashville, TN
Fri, Oct 25, 2013 08:00 PM – Sat, Oct 26, 2013 08:00 PM
Onsale to General Public
Start: Fri, 05/31/13 10:00 AM CDT
Internet Presale
Start: Thu, 05/30/13 10:00 AM CDT
End: Thu, 05/30/13 10:00 PM CDT
You can use this presale passwords and information to order your tickets:
WiseGusy Recommends:When searching for concert tickets through Livenation, please remember that Best Available is not always the best option… you may learn that “the best” is expensive or not what you expected. We suggest choosing a price level or an area of the venue to limit your search.