Taylor Swift is offering fans who attended her 1989 World Tour a keepsake in the form of a live concert film. On Sunday (Dec. 13) — Swift's 26th birthday — the star released the trailer for Taylor Swift 1989 World Tour Live, and it reveals some insight from the singer into her preparations for the tour.

"Getting ready for this, I wondered about a lot of things," she says. "I wondered what it would be like to perform for 70,000 people. I wondered what it would look like if they were all lit up and just dancing around like no one was watching them. I wondered what would happen if I invited the most amazing artists in the world to come out with me and perform on my stage. Would they do it? I wondered what it would be like to get so lost in it every night and never want it to end."

The film was directed by Jonas Akerlund and was shot during the entirety of Swift's concert at ANZ Stadium in Sydney, Australia, on Nov. 28. According to a press release, the concert film will also include backstage footage and tour rehearsals, as well as the many special guests who appeared onstage during Swift's tour along the way, including Alanis Morissette, Alison Krauss, Beck, St. Vincent, Ellie Goulding, Fetty Wap, Fifth Harmony, Idina Menzel, John Legend, Justin Timberlake, Leona Lewis, Lisa Kudrow, Lorde, Mary J. Blige, Mick Jagger, Miranda Lambert, Natalie Maines, Nelly, HAIM, Nick Jonas, Ricky Martin, Selena Gomez, Steven Tyler, the Weeknd, Walk the Moon and Wiz Khalifa.

The 1989 World Tour Live film will be available on Dec. 20 to Apple Music members.

Watch Taylor Swift Perform With Miranda Lambert