Mr. Holland’s Opus (1995, Hollywood Pictures, dir. Stephen Herek) features Richard Dreyfuss as Glenn Holland, who aspires to change the world as a composer with his music-of-the-spheres symphony but pays the rent as a high school orchestra teacher. Eventually, he gets to have his students perform his masterpiece, which, when played, seems structurally rather flawed as a symphonic overture.
Amadeus (1984, Orion Pictures, dir. Milos Forman) won best picture as I recall that year, and presents a dramatic biography of Wolfgang Amadeus Mozart (acted by Tom Hulce), probably the most gifted musical prodigy who ever lived. Really! The story is told by rival Antonio Salieri (F. Murray Abraham) as a protagonist. Salieri’s music sometimes does sound perfunctory by comparison (I have a few concerti on CD’s, rarely played). There are scenes were Mozart (making himself obnoxious by normal social standards of deportment) makes fun of the less gifted by improvising music that comes out perfect. The story of how he composed his Requiem occupies the film toward the end.
This film was shown once when I was substitute teaching in high school, although at 160 minutes it is too long for one 95-minute period.
In Feb. 2019 I attended a peformance of Mozart's Requiem Mass in D Minor, by a local group at a school in Arlington VA. The work, remember, was completed by Franz Sussmayr. The requiem is unusal in that it ends loudly, on a D Octave (the picardy Major can be played.) We accept this as a complete work even though the same is not said of Bruckner's Ninth Symphony, which was almost complete. It is said of Puccini's 'Turandot', completed by Franco Alfano.