The Beatles have unveiled a new clip from the upcoming documentary film, Get Back, in which they rehearse their classic song, “Don’t Let Me Down.”

The teaser includes all four members, plus frequent collaborator Billy Preston on the keyboards, and Yoko Ono, who’s reading a book about the band during the jam session.

During the trailer, Lennon laments the state of his vocals, saying, “My voice is choking. I just wish I had yesterday’s voice with today’s backing,” alluding to the tight instrumental performances from his bandmates.

The video comes just a day after the band unveiled another teaser, during which they show footage of their seminal rooftop performance of “Get Back.”

In a recent interview with the New York Times, the Oscar-winning Jackson (The Lord of the Rings trilogy, They Shall Not Grow Old) has spoken of his almost incredulous delight at being granted the keys to this archive treasure. “It’s sort of that one impossible fan dream,” he says. “‘I wish I could go in a time machine and sit in the corner of the stage while they were working. Just for one day, just watch them, and I’ll be really quiet and sit there.’” Then he adds: “Well, guess what? The time machine’s here now.”

Jackson says that he was given no brief except to restore the film and to tell the whole story of those Beatles sessions at Twickenham Studios. Because The Beatles and Apple Corps have authorized the film, says the director in the interview, “Everyone sort of thinks it’s a whitewash…but actually it’s almost the exact opposite. It shows everything that Michael Lindsay-Hogg could not show in 1970. It’s a very unflinching look at what goes on.” He adds: “You see these four great friends, great musicians, who just lock in and develop these songs, and you see it all onscreen.”

Listen to the best of The Beatles on Apple Music and Spotify.