It was written by Swift and its producers Max Martin, Shellback, and Ali Payami. The song was produced by Max Martin, Shellback, and Fred Gibson. It was produced by Martin and Shellback. Pink co-wrote the song with its producers, Max Martin, Shellback, and Oscar Holter. It was written by Swift, Max Martin and Shellback. It was written and produced by Timberlake, Max Martin, and Shellback. The song is written by Swift and its producers Max Martin and Shellback. "Just Like Fire" was written by Pink, Max Martin, Shellback, and Oscar Holter. Swift wrote the song with its producers Max Martin and Shellback. Swift co-wrote the song with its producers, Max Martin and Shellback. Pink co-wrote the song with its producers, Max Martin and Shellback. The song was written by Savan Kotecha and Shellback. The song was written by Swift, along with Max Martin and Shellback. "Shake It Off" was written by Swift, Martin and Shellback. The album includes a new song "3" produced by Max Martin and Shellback.