Question: who sang the original version of let it rain
[{'answer': 'Eric Clapton', 'provenance': [{'wikipedia_id': '34448216', 'title': 'Let It Rain (Eric Clapton song)', 'start_paragraph_id': 0, 'start_character': 13, 'end_paragraph_id': 0, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34448216', 'title': 'Let It Rain (Eric Clapton song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 227, 'bleu_score': 0.68664884756443, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9103893331379608549}, 'section': 'Section::::Abstract.'}]}]