Luke Bryan is out on tour right now and it's not uncommon for country artist to have friends stop by for a visit during a show! That's exactly what happened when Luke Bryan was playing Vanderbilt Stadium on July 11th. The boys from Florida-Georgia Line stopped by to sing Alabama's "Mountain Music" and then Journey's song "Faithfully." F-G Line only really knew the "Oooo" part of "Faithfully" but they gave it a valiant effort so I'll give them a pass.