Johann Strauss II - The Blue Danube (Reprise) (via 2001: A Space Odyssey: Original Motion Picture Soundtrack)
Q. You have abandoned original film music in your last three films.
Stanley Kubrick: “Exclude a pop music score from what I am about to say. However good our best film composers may be, they are not a Beethoven, a Mozart or a Brahms. Why use music which is less good when there is such a multitude of great orchestral music available from the past and from our own time?”
(via Michel Ciment’s Kubrick: The Definitive Edition)