 Complete the following phrase:  In April 2011, the band joined Mumford  Sons and Old Crow Medicine Show on the Railroad Revival Tour. According to American Songwriter, the tour stopped in six cities, playing alternative venues such as an Austin, Texas high school where Mumford  Sons taught the marching band how to play their hit The Cave. The tour was also the subject of Grammy-nominated director Emmett Malloys latest documentary Big Easy Express, which strove to capture the pure joy of music through Americana folk imagery. The documentary went on to win in the category for Best Long Form Music Video at the 