 The siren Parthenope (soprano) is in love with the musician Linus (haute-contre), but Urania (soprano), the Muse of astrology, urges him to beware of traps of love passions, for gods alone can come through them unharmed, while they will always cost humans their peace of mind.However, after her departure, Linus and Parthenope meet and confess their mutual love, whereupon the siren proposes taking vengeance on the Muses and on their enduring struggle against love ardour