Question: who sang a nightingale sang in berkeley square first
[{'answer': 'Maschwitz', 'provenance': [{'wikipedia_id': '404198', 'title': 'A Nightingale Sang in Berkeley Square', 'start_paragraph_id': 1, 'start_character': 111, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '404198', 'title': 'A Nightingale Sang in Berkeley Square', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 604, 'bleu_score': 0.749111139234052, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8052545665502300403}, 'section': 'Section::::Composition.\n'}]}]