What do you mean where does the music come from? Where does the music ever come from? The guy says to the girl Something is on my mind and the girl says Really? What is it? and somebody in the orchestra hits a note and they sing. That’s where the music comes from.
Morris Ryskind on the set of a Marx Brothers movie. This is the epigraph to Daniel Handler’s 2006 novel Adverbs (via swartzmark)