1989 was released on October 27, 2014. The album marked a move away from Taylor Swift's earlier country sounds and fully into pop. The album became the best-selling album of 2014, selling 3.7m copies in USA, and as of April 2015, it had sold 4.5m copies in the US (9m worldwide). The first single from "1989", Shake It Off", released on August 18, 2014, reached number one on the Billboard Hot 100. Commentators described the album as being synthpop and reminiscent of Toni Basil's "Mickey. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.