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In page Apollo:

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Apollo is said to have been the lover of all nine Muses, and not being able to choose one of them, he decided to remain unwed. He fathered the Corybantes by the Muse Thalia.[1] By Calliope, he had Hymenaios, Ialemus, Orpheus[2] and Linus. Alternatively, Linus was said to be the son of Apollo and either Urania or Terpsichore.[citation needed]