[5] Styles co-wrote the song "Just a Little Bit of Your Heart" with Johan Carlsson which was included on Ariana Grande's second studio album My Everything (2014).
[6] Styles also co-wrote the song "I Love You" with Carlsson which was recorded by Alex & Sierra for their debut studio album.
[9] For his second studio album, Styles partnered with longtime friend and standout producer Thomas Hull, who also had a small role in his debut record, as well as former collaborators Johnson, Rowland, and Bhasker.
He's collaborated with OneRepublic lead singer Ryan Tedder, EGOT recipient John Legend, and Snow Patrol pianist Johnny McDaid.
Colleagues of Styles have indicated that he's composed music with Taylor Swift,[15] Bruno Mars,[16] and Max Martin,[16] though no works have been registered as of yet.