Martin produced and co-wrote the latest single on Swift's new album "Shake it Off" which was released on August 18,2014 and debuted at No.1 on the Billboard Hot 100.
Martin produced and co-wrote the latest two singles on Swift's new album, "Shake it Off" and "Blank Space", which were released on August 18,2014 and November 10,2014 respectively. Both debuted at No.1 on the Billboard Hot 100.