Question: what character sings summertime in porgy and bess
[{'answer': 'Clara', 'provenance': [{'wikipedia_id': '219642', 'title': 'Porgy and Bess', 'start_paragraph_id': 23, 'start_character': 201, 'end_paragraph_id': 23, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Performance history.:1952 touring production.\n'}]}, {'provenance': [{'wikipedia_id': '219642', 'title': 'Porgy and Bess', 'start_paragraph_id': 52, 'start_character': 0, 'end_paragraph_id': 52, 'end_character': 1845, 'bleu_score': 0.9939667486605511, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5791828463177290092}, 'section': 'Section::::Synopsis.:Act 1.\n'}]}]