The funeral scene in "Amadeus" (1984) uses the movement Lacrimosa, from the piece Requiem. Mozart was commissioned to write this piece but became quite ill and came to believe he was writing his own funeral soundtrack.

hyperlinks:

og tune: https://en.wikipedia.org/wiki/Lacrimosa

og piece: https://en.wikipedia.org/wiki/Requiem_(Mozart)

movie: https://m.imdb.com/title/tt0086879/

the hyperlink: https://youtu.be/cw6Q4j_fy8E

tune remoted from film: https://youtu.be/MafAZeag1_0

this tune was a mysterious fee, probably from a shitheel noble (https://en.wikipedia.org/wiki/Franz_von_Walsegg) who favored to purchase music and move it off as his personal.