Zeus lay with the Titaness Mnemosyne for nine consecutive nights, producing the nine Muses: Calliope, Clio, Erato, Euterpe, Melpomene, Polyhymnia, Terpsichore, Thalia, and Urania, who preside over the arts and sciences.
The river god Achelous and the muse Terpsichore bore the Sirens, the bird-women whose irresistible song lured sailors to their deaths on the rocky shore.
⚠ Apollodorus gives both Melpomene (Epitome 7.18) and Terpsichore (Bibliotheca 1.3.4) as the Sirens' mother in different passages, reflecting genuine ancient uncertainty about which Muse bore them.
The nine Muses — Calliope, Clio, Erato, Euterpe, Melpomene, Polyhymnia, Terpsichore, Thalia, and Urania — each preside over a specific art or science.
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