Autores:
  • As great Pythagoras of yore,
    Standing beside the blacksmith's door,
    And hearing the hammers, as they smote
    The anvils with a different note,
    Stole from the varying tones, that hung
    Vibrant on every iron tongue,
    The secret of the sounding wire.
    And formed the seven-chorded lyre.

    Henry Wadsworth Longfellow (1848). “Poems”, p.105