The collaborator, 40, posted photos and a clip of Swift making her latest album on Instagram on April 19

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Jack Antonoff is proud of his latest work with Taylor Swift.

On Friday, April 19, the record producer and longtime collaborator, 40, posted behind-the-scenes photos and footage of Swift, 34, recording her new album The Tortured Poets Department as he reflected on his time creating the project with the singer.

Antonoff, who is credited as the producer on Swift’s latest album which was released on Friday, described it as “my favorite work we have made together” on Instagram as he shared snaps of Swift in the studio and a clip of her singing the track “Black Dog” — which appears on The Tortured Poets Department: The Anthology, the surprise double album version of the new record that Swift announced at 2 a.m. on April 19.

“TTPD is here,” he wrote in the caption. “My favorite work we have made together / made in the most wild unhinged moment. All the pain distilled in this album and all the laughter that came out of it. I will hold those days in the studio forever as the most inspiring of my life. I adore this album and the way it came together. “

Antonoff continued with a list that detailed each photo included in the post, which included songs the singer and producer recorded together for the album and shout outs to the album, audio engineer Laura Sisk and Swift herself.

“ttpd FOREVER. 1- the day we made down bad. 2- fots day. 3- florida. 4- laura sisk forever. 5- black dog. 6- electric lady. 7- i love you taylor!” he wrote.

The Bleachers frontman then credited the contributors of the album, including featured artists Post Malone and Florence Welch, before signing off with, “from 1989 to TTPD,” referring to the first and latest albums he has recorded with Swift.

Included in the post were grainy Polaroids of Swift sitting on a couch with her phone and her singing in a cozy-looking recording booth. In one video shared, Swift wore headphones as she sang “Black Dog” into a microphone indoors while surrounded by vases of plants and flowers.

Swift was joined by Welch, 37, in an array of other Polaroids taken as the pair embraced and laughed on a couch indoors, seemingly during the time they recorded the track “Florida!!!” together, which features on the new album. Another black-and-white snap showed Swift sitting on Sisk’s lap in a recording studio.

Antonoff also shared a snap of a drum kit that appeared to be from Electric Lady Studios in New York City, a favorite recording location for Swift and her producer friend. The final snap in the carousel showed the “Blank Space” singer wearing a pair of black, circular-framed glasses that seemed to be the same ones usually worn by the producer himself.

Antonoff and Swift’s friendship and collaborative partnership first began in 2012, at which time the pair worked on the song “Sweeter Than Fiction” for the One Chance movie soundtrack.

The friends have since created many of Swift’s greatest hits, including her Grammy-winning albums 1989 and Folklore, cementing their musical relationship together.

Following the release of TTPD, Antonoff also praised the album on X (formerly Twitter), writing, “love this album more than i can say …. love you all very much … more later very overwhelmed … love you Taylor.”