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
“Eloquence resides as much in the tone of voice, in the eyes, and in the expression of the face, as in the choice of words.” —François, Duc De La Rochefoucauld (1613–1680)
“When you listen to gongs and drums, listen to the music; when you listen to someone talk, listen to his tone of voice.” —Chinese proverb.
“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)