1989 is the fifth studio album by American singer-songwriter Taylor Swift, released on October 27, 2014, through Big Machine Records. After music critics questioned her status as a country musician following her pop and electronic-influenced fourth studio album Red, Swift was inspired by 1980s synth-pop to recalibrate her artistry from country to pop music. On 1989, titled after her birth year to signify her symbolic artistic rebirth, Swift enlisted Max Martin as co-executive producer. The album's synth-pop sound is characterized by heavy synthesizers, programmed drums and processed backing vocals. The songs, expanding on Swift's songwriting practice taking inspiration from her personal life, express lighthearted perspectives towards failed relationships, departing from her previous hostile attitude. Swift and Big Machine promoted the album extensively through product endorsements, television, radio appearances and social media. They pulled 1989 from free streaming services such as Spotify, prompting an industry discourse on the impact of streaming on music sales. After the album's release, Swift embarked on the 1989 World Tour, which was the highest-grossing tour of 2015. The album was supported by seven singles, including three US Billboard Hot 100 number ones: "Shake It Off", "Blank Space" and "Bad Blood". Critics generally praised 1989 for its emotion and melodies, but a few were concerned over the synth-pop production, as they felt it eroded Swift's authenticity as a s