If you have never seen Amadeus you owe it to yourself to see this film. I recall seeing it in the theatres (dragged against my will) and was thankful for it.
This is the penultimate scene, in which Salieri, dying Mozart's mediocre rival, acts as copyist, as Mozart completes what amounts to his own Requiem.
While many will frame this movie simply as the conflict between genius and envious mediocrity, I believe Amadeus is really about the sin of pride, the most serious of the seven deadly sins. Salieri, even at the end of his life, cannot admit his sin to the priest attending to him.
Go rent Amadeus this weekend, or watch it on Netflix if it is available there.