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
“Whose are the truly labored sentences? From the weak and flimsy periods of the politician and literary man, we are glad to turn even to the description of work, the simple record of the month’s labor in the farmer’s almanac, to restore our tone and spirits.” —Henry David Thoreau (1817–1862)
“It hurts me to hear the tone in which the poor are condemned as “shiftless,” or “having a pauper spirit,” just as it would if a crowd mocked at a child for its weakness, or laughed at a lame man because he could not run, or a blind man because he stumbled.” —Albion Fellows Bacon (1865–1933)
“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)