1989 (Taylor Swift album)
As of January 2016, six singles have been released.  The first four were "Shake It Off", "Blank Space", "Style", and "Bad Blood".  The first, second, and fourth singles all reached number one on the US Billboard Hot 100, while the third single reached number six.  The fourth single, "Bad Blood", was also released as a remix featuring American rapper Kendrick Lamar.