It’s The Undertaker’s theme song “Rest In Peace.”
I predict we will hear of another death this week. (They’ll put off announcing it until they need a distraction.)
As Oratam said above, it is originally Chopin’s “Funeral March.” I seem to remember it from Bugs Bunny cartoons when the anvil would fall. Or maybe it was the Roadrunner when the coyote would run into the rock wall painted with the train track 😄