A libretto may be based on moments of a history.Logical formLearned from2 sentences. A piece may combine a libretto.Logical formLearned from2 sentences. Operas may have a libretto.Logical formLearned from2 sentences. A libretto may be sung in a language.Logical formLearned from2 sentences. An opera may use a libretto.Logical formLearned from2 sentences. A libretto may be adapted from a play by a male.Logical formLearned from2 sentences. A composer may adapt a libretto himself.Logical formLearned from2 sentences. Drama may write librettos.Logical formLearned from2 sentences. A libretto may emphasize themes.Logical formLearned from2 sentences. A libretto may set a drama.Logical formLearned from2 sentences. A male may send part of a libretto to a male.Logical formLearned from2 sentences. A libretto can be gloomy.Logical formLearned from2 sentences. A libretto can be by a father.Logical formLearned from2 sentences. Writers can be constituted-of-or-filled-with librettos.Logical formLearned from2 sentences. A person may write (opera librettos).Logical formLearned from2 sentences.