From the movie San Francisco (1936). This singer (Jeanette MacDonald) is down on her luck in turn of the century San Francisco, but gets a job singing for charming scoundrel Blackie Norton (Cary Grant), owner of the Paradise Cafe, a den of iniquity.
But she's then torn between singing for Norton and Jack Burley (Jack Holt), who's literally from Nob Hill, and singing opera. She goes where the class and money are. But later, she competes in a talent show at the Chickens' Ball on behalf of Norton, winning him a much needed ten grand; but bitter Blackie doesn't want nothing to do with her squeaky-clean, non-ill-gotten money.
Then the movie suffers the double whammy of the Great San Francisco Earthquake of 1906 and the Hays Code. Sinner Blackie must repent and turn to God, and a hallucinatory citizenry turn to song to show that no crummy earthquake is going to keep them down.