Dennis Potter's TV dramas, especially Pennies from Heaven and the Singing Detective - and I'm talking about the originals here, not any big screen variants - stand out in this context, bringing to life the famous Noel Coward line in Private Lives "Extraordinary how potent cheap music is."

I think there is a way in which light, even trivial songs, can sometimes sneak in under our barriers of cynicism in a way that objectively better songs cannot do.
..............
Drifting slightly, I love the way that familiar songs can so often reveal new meanings when they are used as soundtracks to some seemingly irrelevant activity. For example the collages you often get at the end of coverage of some sporting event on TV. British TV that is - I don't know if it happens elsewhere.