Backstage at the Academy of Country Music Awards Sunday night (April 15) in Las Vegas, Jennifer Nettles and Kristian Bush talked about the tune, which Swift co-write with Train’s Pat Monahan.
"[Taylor] reached out. We [have] obviously known each other for many years. When she was first getting started we had just had our first little EP out, called Premium Quality Tunes,” Nettles said. “She still has a copy of it that we signed for her whenever we played a couple of shows together. She was excited we were getting back together and reached out and said, ‘Hey, I have a song.' That is a short list, ladies and gentleman, of people to whom she has said, ‘Hey, I have a song, you want to sing it?’ So we said, ‘Yeah!'"