Question: who was the original singer of green green grass of home
[{'answer': 'Johnny Darrell', 'provenance': [{'wikipedia_id': '3238724', 'title': 'Green, Green Grass of Home', 'start_paragraph_id': 1, 'start_character': 97, 'end_paragraph_id': 1, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3238724', 'title': 'Green, Green Grass of Home', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 474, 'bleu_score': 0.6682643124934, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6011333950052469908}, 'section': 'Section::::Abstract.'}]}]