Jack Antonoff Says Taylor Swift 'Wrote Every Stitch' of New Song 'Lover' Before He Joined Her in the Studio

Jack Antonoff and Taylor Swift
Christopher Polk/Getty Images for NARAS

Jack Antonoff and Taylor Swift attend The 58th GRAMMY Awards at Staples Center on Feb. 15, 2016 in Los Angeles.

Soon after Taylor Swift released her emotional new ballad "Lover," the title track off of her upcoming album, co-producer Jack Antonoff shared some details about the song's studio session on Twitter. Swift, who's credited as the sole songwriter, penned the love song at the piano the night before joining Antonoff and sound engineer Laura Sisk at New York's Electric Lady Studios.

"lover the song out today. did this one entirely at electric lady in NYC. only laura sisk and taylor in the room. taylor wrote every stitch of this song and came in and played it for me - just a perfect moment to hear what she had done alone the night before," Antonoff said on Twitter Friday (Aug. 16).

He went on to describe the six-hour session that commenced: "when someone brings in a song that speaks so much just on a piano it’s rare to imagine production around," he wrote, "but then we started playing with space echo reverb on a snare hit really hard with a brush."

"from there the 'paul' bass happened and the washy piano. melotron in bride to sound like a dream sequence wedding. but the part i’m most proud of is her voice drowned in verb. cuts right through and sits all around you at the same time. worked that night for about 6 hours and besides the mix all the tracks and takes are from then. live drum, bass, acoustic, 12 string, upright piano and melotron. all going through copycat and space echo. big mess until it’s not," said Antonoff, who also lent a hand to Lover track "The Archer."

Swift confirmed the full track list of Lover the album on Friday, revealing that "Lover" the song is track three. A music video for the song will premiere on Aug. 22 following a 5 p.m. ET YouTube live stream ahead of the album's release. The full album drops on Aug. 23.

See Antonoff's updates about working with Swift below.