As of October 2013, Swift was "six months deep in the songwriting process". In November 2013, the singer told Billboard that, "There are probably seven or eight [songs] that I know I want on the record. It's already evolved into a new sound, and that's all I wanted." In February 2014, Swift confirmed she was again working with Max Martin and Shellback, this time writing "a lot more than three songs together."Diane Warren and Ryan Tedder have also worked on the album.
Release and promotion
Swift began teasing about an announcement in August 2014. On August 4, she posted a video on Instagram in which she pushes the number 18 in an elevator. On August 6, she tweeted an image of the time 5:00 and the next day a screenshot from a Yahoo! homepage. She later confirmed on August 13, 2014 on The Tonight Show Starring Jimmy Fallon that a Yahoo! live stream session would take place on August 18, 2014 at 5pm. Swift announced the album details during a Yahoo! live stream on August 18, 2014. She first premiered the album's first single, "Shake It Off", which was written and produced by herself, Max Martin, and Shellback. She then unveiled the album cover, a polaroid picture with "T. S. 1989" written underneath. The music video for "Shake It Off", directed by Mark Romanek, was also premiered during the live stream. It features professional dancers, Swift, and several fans picked from Instagram, Twitter, and fan letters she received. The album was made available for pre-order after the live stream ended.
Swift described the album as her "first documented, official pop album", stating that she was inspired by the late 1980s pop while recording it.