No one is cured of a near-fatal disease unless music plays. The good guy doesn’t find the bad guy until the dramatic music arrives. No one is discovered in a pool of blood until drums resonate. No one has an epiphany about who killed the person in the pool of blood until the organ plays.
Hitchcock doesn’t complete a film until the violins play. When the violin stops, someone is missing. Someone is dead. Someone may still be alive, but we don’t know where they are.
As a tip, if you are in a theatre and really need to go to the bathroom, wait till the music dies down, then make a dash. Just return before the music does, because things are about to get real. (Note to theaters: put a sound machine next to each toilet so users can select their own musical effects. Perhaps the opening of the Batman TV theme, “Nana nana nana nana” or Fred Flintstone, “Yabba Dabba Dooooo,” before dramatically exiting the stall … but I digress.)