The first song Taylor Swift has released since splitting from longtime love Joe Alwyn.
The 33-year-old vocalist has worked with Aaron Dessner for a very long time.
Additionally, she recently contributed her vocals to the band The National's new song The Alcott from their album First Two Pages of Frankenstein.
Taylor Swift and The National's lead vocalist Matt Berninger both sing on the band's brand-new song, "The Alcott."
Back in love with you is the final line that Taylor sings in the song.
The song appears to be about two individuals going through a difficult time in their relationship, with one of them feeling guilty for messing everything up.