Question: who was the 50s rocker who used strings on his recordings and overdubbed voices and guitars
[{'answer': 'Edward Raymond Cochran'}, {'provenance': [{'wikipedia_id': '164363', 'title': 'Eddie Cochran', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 601, 'bleu_score': 0.959396932335234, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15114159935133135707}, 'section': 'Section::::Abstract.'}]}]