According to his official North Korean biography, Kim Jong Il initiated “an epochal change in the history of the modern opera” by introducing an offstage song called a pangchang—an innovation, claims the bio, “greater than the discovery of the heliocentric theory by Nicolaus Copernicus or the discovery of the New World by Christopher Columbus.”

Humpback whales, which have a sonic range of at least seven octaves, create songs between the length of a modern ballad and a symphony movement, possibly because their attention span is similar to that of humans. Their tunes also contain repeated refrains that form melodic rhymes, suggesting that, like humans, they use these as mnemonic devices.

In 2014 Amelia Hamrick, an undergraduate at Oklahoma Christian University, noticed musical notes written across the buttocks of one of the denizens of hell depicted in Hieronymus Bosch’s painting The Garden of Earthly Delights. She transcribed it into modern notation and made a recording she posted on her blog. “So yes,” she wrote, “this is literally the 600-year-old butt song from hell.” The post went viral.

“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.”