Question: who wrote music for singing in the rain
[{'answer': 'Nacio Herb Brown', 'provenance': [{'wikipedia_id': '1883151', 'title': "Singin' in the Rain (song)", 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1883151', 'title': "Singin' in the Rain (song)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 103, 'bleu_score': 0.8600551563736071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17709620413159011269}, 'section': 'Section::::Abstract.'}]}]