Question: who sang heard it through the grape vine
[{'answer': 'Marvin Gaye', 'provenance': [{'wikipedia_id': '1124294', 'title': 'I Heard It Through the Grapevine', 'start_paragraph_id': 2, 'start_character': 109, 'end_paragraph_id': 2, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]