Listen for an ethereal melody. The unicorn sounded a brief melody. -- Piers Anthony, Phaze Doubt (1990) Unicorns sometimes hum a soft, ethereal song that seems familiar at first but then fades into oblivion. One is reminded of Edgar Allan Poe's description of a voice "like the spirit of a departed sound" ("Berenice," 1835). This stunning waveform depicts a unicorn's ethereal intonations fading into oblivion.