Question: who composed the music of the german national anthem
[{'answer': 'Joseph Haydn', 'provenance': [{'wikipedia_id': '8203', 'title': 'Deutschlandlied', 'start_paragraph_id': 3, 'start_character': 96, 'end_paragraph_id': 3, 'end_character': 108, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]