Question: when did the song thunder rolls come out
[{'answer': 'April 1991', 'provenance': [{'wikipedia_id': '6130405', 'title': 'The Thunder Rolls', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6130405', 'title': 'The Thunder Rolls', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 247, 'bleu_score': 0.763122326278424, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5361514142391084376}, 'section': 'Section::::Abstract.'}]}]