In case no one has mentioned this, there's the playing of the theme tune by
various diegetic means (musical door chimes, supermarket muzak etc.)
throughout THE LONG GOODBYE.
A local variation occurred in the long-running Australian TV soap NEIGHBOURS,
where one character proposed to another in a restaurant, and at that point a
violinist appeared, playing ... the theme tune to NEIGHBOURS.
Kate Bowles
Screen Studies, University of Wollongong