Florida Georgia Line & Tim McGraw

Florida Georgia Line came out of nowhere in 2012 to become the biggest country group of the new decade. The vehicle of their success was "Cruise," a slick, shimmering ode to the wide-open road that became an unkillable crossover hit in 2013 and, eventually, the biggest country single of all time. After "Cruise" broke through on its own merits, reaching 16 on the Billboard Hot 100, its life was extended thanks to a remix featuring rapper Nelly. This unexpected collaboration pushed the single all the way to number four on the Hot 100, but at that point it was clear that the appe...