Think of the upcoming concert by John Prine and Richard Thompson as a graduate class in folk music, wrapped in an atmosphere of pure enjoyment. How else to describe the event that pairs two legendary folk musicians? Not that the two have any pretense or likely even think that their work as revolutionary.

“The dressing rooms are bigger and cleaner, and the money gets better,” Prine is famously quoted as saying to an unknown writer when asked about his international success.