Florida Georgia Line landed on the cover of Billboard magazine.  It's just another notch in the belt of a duo that is simply taking over the music world.

They have spent much of the year touring with two of country's hottest artists, Taylor Swift and Luke Bryan.  But, they will spend the last part of the year headlining big shows.  A special one-off headlining gig sold out in 23 minutes.

It normally takes several years for country stars to become popular enough to headline in big venues.  Luke Bryan is on his first big headlining tour.  Bryan's first album released in 2007.  Florida Georgia Line released their first album in 2012 and one year later they're booking arenas.

How did they blow up so fast?

The duo credits their fans.  Brian Kelley explains, "I think people are looking for something fresh and new. Our fans seems to spread the music like wildfire. That doesn't always happen, and it's special to us, and we're blessed to be a part of it."

Kelley also says that he and bandmate Tyler Hubbard are learning from their time with Swift and Bryan.  He adds, "There's a reason they're selling the tickets they are, winning the awards they are. We're out there taking notes, taking it all in, seeing how they're doing it. Every night is just a learning experience."

Billboard calls Florida Georgia Line the, "New sound of country rock."  But, their sound is much more than that.  One of the songs on Here's to the Good Times, It'z Just What We Do, is "sort of like Lynyrd Skynyrd meets Lil Wayne," according to the magazine.  Hubbard says they're happy to mix it up with songs like that, "It puts us in a slot to be able to get out of the box and step out of the country music boundaries a little bit, and hopefully innovate a little bit."