My parents once upon a time belonged to a Theatre Organ Association, and they took me with them to see Phantom of the Opera. I enjoyed the concert before the movie (although not as much as the true believers did) and was just thrilled watching the movie itself. I frankly can't remember how much the organ music contributed to my enjoyment, it was so long ago. But I do happen to believe that just listening to live music is a treat in itself, so I would definitely vote for "essential."

A few years ago I was startled to discover a 1922 silent starring Anna May Wong that's IN COLOR. A very early color process, obviously, but it isn't just tinting. It's an odd, but lovely thing to experience. 'The Toll of the Sea' at YouTube!