Assuming a tempered scale with A=440 Hz, a 60 Hz tone is almost exactly halfway between A♯ (58.24 Hz) and B (61.68 Hz) two octaves below Middle C, and a 50 Hz tone is between G (49.04 Hz) and G♯ (51.93 Hz) two octaves below Middle C, but slightly flatter than the quarter-tone. These notes fall within the range of a 4-string bass guitar.
60 Hz mains hum
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5 seconds of 60 Hz mains hum
“Self-confidence is apt to address itself to an imaginary dullness in others; as people who are well off speak in a cajoling tone to the poor.” —George Eliot [Mary Ann (or Marian)
“He doesn’t know a damn thing about China ... That’s what makes him an expert. He knows nothing about music, being tone deaf. That’s what makes him a musician ... And he’s batty in the head. That’s what makes him a philosopher.” —William Carlos Williams (1883–1963)
“It makes me hate accepting things that are probable when they are held up before me as infallibly true. I prefer these words which tone down and modify the hastiness of our propositions: “Perhaps, In some sort, Some, They say, I think,” and the like.” —Michel de Montaigne (1533–1592)