Michel de Montaigne’s father believed “it disorders the tender brains of children to awake them by surprise in the morning, and suddenly and violently to snatch them from sleep”; he preferred to rouse his son from slumber “by the sound of some instrument of music,” likely an early form of harpsichord called an epinette. Montaigne recalled later that he “was never without a musician for that purpose.”

Researchers working with the Tsimané of the Amazon found that tribe members could tell the difference between consonance and dissonance but took them to be equally pleasant, giving credence to the idea that Western preference for consonance is not biological. “The Greeks were really into ratios,” speculated the lead researcher. “It’s possible they started making music that way and we’ve been stuck with it ever since.”

“Please send me something I can set to music, only don’t make it the history of the world, the Thirty Years’ War, the era of the popes, or the island of Australia,” wrote Fanny Hensel to her brother Felix Mendelssohn in 1834. “Instead, find me something really useful and solid.”

Hoping to encourage hostages held by FARC during Colombia’s civil war, state negotiators commissioned a local producer in 2010 to create a pop song embedded with a Morse-code message and had it broadcast repeatedly on the radio in rebel-controlled areas. After the lyrics “Listen to this message, brother,” the code sounded as a synth interlude: “Nineteen people rescued. You are next. Don’t lose hope.”