A female may sing on stage.Logical formLearned from46 sentences. A female may sing backup.Logical formLearned from46 sentences. A US-city may sing.Logical formLearned from46 sentences. A male may sing opera.Logical formLearned from46 sentences. A wife may sing.Logical formLearned from45 sentences. A group of 80-somethings may sing (roll covers).Logical formLearned from45 sentences. A person may sing hymns.Logical formLearned from45 sentences. A person may sing birthday.Logical formLearned from45 sentences. A US-president may sing.Logical formLearned from45 sentences. A female may sing for a time.Logical formLearned from44 sentences. A female may sing on an album.Logical formLearned from44 sentences. A person may sing a note.Logical formLearned from44 sentences. A male may sing a tune.Logical formLearned from44 sentences. A person may sing for a male.Logical formLearned from44 sentences. A sister may sing.Logical formLearned from43 sentences.