There's a lot of different kinds of music in this big wide world, so many different kinds of music that nobody could even name them all. Everybody could name a few though, and two kinds of music that almost everybody can name are Rock and Country. Each of them is its own wide world, and although they do share some history, they don't share a lot of artists, or a lot of audiences.
There's plenty of music in America, and a lot of it's out on the road, rolling down interstates, sea to shining sea. The tour buses carrying Rock acts look a lot like the ones carrying Country acts, but even if they do pass each other on the interstate, they'll always be in two very different worlds. It's true that Rock and Country have a few things in common, and the more acoustic, lyrical kinds of Rock aren't all that different from some Country music. Still, the louder and heavier Rock gets, the less it sounds anything like the handcrafted story songs from a Nashville session, where most of the guitars are played undistorted, and the pedal steel might answer every careful line of a clear, melodic vocal.
That makes Aaron Lewis a very unusual story, because after sixteen years in a band called Staind (who've sold fifteen million very heavy rock albums), he recorded five country songs and put them together on an independent country EP. It had a picture on the cover of a sign by the side of the road that said "Entering Nashville", and he called it Town Line. If that doesn't sound all that astonishing, it's because that's not the really unusual part. When Town Line was released in March, 2011 it became the No. 1 Country album, and that's not only way past unusual, it may be unprecedented.