I think Bob mentioned this documentary on one of his shows. It's about The Mumford and Sons, Edward Sharpe and the Magnetic Zeroes & Old Crow Medicine Show traveling across America on a train. It's a bit like Festival Express from over 40 years ago without the drugs and booze! Just young folks getting high on Bluegrass/Folk music all the way to New Orleans. I think as much as anything it brings home how great this music is to play live and how much people appreciate it.
Did anyone see Damon Albarn on the BBC with the Africa Express? It's a collective of African and Western musicians traveling in a train with dozens of guest artists playing shows in Middlesbrough, Glasgow, Cardiff, Bristol and London.
Hope someone makes a documentary out of this one! I bet the music will be just as good.