Arriving at the twilight of the post-grunge era, Train combine rootsy mainstream rock with tried-and-true classic rock, an aesthetic epitomized by their breakthrough hit "Drops of Jupiter." Taken from the 2001 LP of the same name, that international smash gave Train a career, but the group turned into superstars in 2009 when the breezy, sextuple-platinum-selling "Hey, Soul Sister" established the combo as adult contemporary superstars.