I remember the scene of during the world war ll there was a lot of destruction like buildings and some japanese people and japanese children walkin around helping to move things. But i remember a man that began to play the piano in the center of the place, a vertical piano, this man is american with short hair well combed, white skin black hair, tall , maybe with formal suit , and he played a beautiful music moment .It looks like a movie of the 70s or 80s fr the form of the film and camera.
Hmmm, might be Empire of the Sun?