Calypso ("she who hides or conceals") was the daughter of Thetis and either Atlas, Nereus, or Oceanus. Odysseus was detained on her island home of Ogygia for seven years with the promise that she would make him immortal. Though he enjoyed her bed, each day he would weep and look longingly over the sea to his homeland Ithaca. Eventually Zeus sent Hermes to inform Calypso that she must give up Odysseus. Calypso music, derived from the name of the nymph, originated on the islands of the West Indies and treats of topical or amusing themes.