I watched a great favorite yesterday The Fallen Sparrow. A minor story arc is the kid cousin of one of the hero’s friends, who is trying to make as a cabaret singer. She sings a lovely song ( dubbed by Martha Mears ) called Beware. It reappears at the end as a mad Gypsy dance performed by Fely FRanquelli. With rapid cutting the scene is full of anxiety.
it made me wonder about song and or dance numbers that played a pivotal role in a non musical film. I will suggest a few later.
Anyone can start an insane asylum with an empty room and the right kind of people