Jack Antonoff and Taylor Swift. Kevin Mazur/Getty Images for The Recording Academy Tap Here To Add Us Weekly As A Trusted Source Add as a preferred source on Google Taylor Swift has had plenty of collaborators over the years, but none of them have stuck quite like Jack Antonoff. Since their 2012 meeting, the pair have worked together on 10 albums and a few one-off singles - and became best friends in the process. "Sometimes he sits at the piano and we both just start ad-libbing and the song seems to create itself," Swift told The New York Times in May 2017.