I haven’t seen “Get Back” yet, but I’ve noticed two common elements in many of the reviews I’ve seen — it’s really long, and there’s an amazing moment when, as the rest of the band waits for John Lennon, Paul McCartney creates “Get Back.”
I’ll save you about 8 hours: Here’s that moment.
https://www.youtube.com/watch?v=9kOQ5sgzhRA