Question: who wrote the texts or libretti of richard wagner's music dramas
[{'answer': 'Wilhelm Richard Wagner', 'provenance': [{'wikipedia_id': '25452', 'title': 'Richard Wagner', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25452', 'title': 'Richard Wagner', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 880, 'bleu_score': 0.883020673097437, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6655263383896293085}, 'section': 'Section::::Abstract.'}]}]