Train + The Wallflowers

These old-fashioned Californian rockers have been active for years, though are probably still best known for their FM-friendly 2001 single "Drops of Jupiter" or 2009 hit "Hey, Soul Sister." They are joined by the Wallflowers, who recorded their most recent album in Dan Auerbach's (of the Black Keys) studio and featured Mick Jones of the Clash. Huh, that's almost cool.