You know how you instantly have one go-to track on a new album? The one you turn up a little louder every time it comes on, over and over again? On Pain Killer -- the brand new Little Big Town album due out Tuesday (Oct. 21) -- that song for me is "Girl Crush."

So it's like I literally have a girl crush on "Girl Crush."

And it's not just because of the way Karen Fairchild sings it (lovely) or the way the music backs her (sparsely). It's because this is a song that makes me believe that not all the good ideas are taken.

Just as a side note, I'm the kind of person who usually hears a new country song and goes, "Oh, yeah. Cool. Just like (artist) sang it back in (year)." I can be snarky about it, too. Like, "I love that tune. Almost as much as I did when Keith Urban sang the exact same thing back in 2003." Or whatever.

In other words, I've heard it all before.

But not this time. "Girl Crush" is about a girl obsessing over another girl because that girl stole her lover. (On the other hand, it could also be about a girl obsessing over the girl who is with the man that she wants but has never had. That mystery is unclear, which only adds to the allure of this song.)

So it's not really about a girl crush, per se. There are no explicit sexual lyrics or any bi-curious innuendo. It's more about wanting to taste her lips in order to taste him and to drown in her perfume, to have her long blond hair -- and so on -- all in an effort to get him back. So the crush/obsession is just the inability to get her off her mind.

This song is one of the few that the band didn't write on this album. "Girl Crush" came from the behind-the-scenes country star trio of Lori McKenna, Liz Rose and Hillary Lindsey. And if anyone knows how to write a country song that's never been written before, it's these three.