“One to One” charts Lennon’s close friendship with Elton John, though at this point the film is cheating a bit, since that all happened later ­— in 1973 and 1974, which is when their ...

The thread that winds throughout “One to One” is the Aug. 30, 1972, concert of the movie’s title that Lennon and Ono coordinated at Madison Square Garden alongside the likes of Stevie Wonder ...