Sister Megan warbles softly at first, before putting the full might of her lungs and vocal cords behind the melody and lyrics.

By spotlighting her child’s untrained warble, Perry is attempting to demonstrate the human stakes of that undertaking while showing us that, as a record maker, she’s living by her own advice.

“We’d like to thank everyone for being here tonight,” he said in a muffled warble.

Then comes that "no no no no please don't" passage, when Barrymore's voice shudders with a tender warble.

Like a trio of canaries in a coal mine warbling at the top of their lungs, three recent studies warn of various ways that global warming is drastically changing the planet.