-- these are brothers who love each other desperately even at the end. >> yeah. the conversation we never would have seen without the movie obviously sitting in the vault. the film is called "get back." there's a moment where we're present at the birth of this song "get back." it's paul mccartney picking on the guitar. the guys look bored. there's yawning. and then we hear a song come to be. let's listen. ♪♪ ♪♪ ♪♪