Question: when did imagine dragons first song come out
[{'answer': '2010', 'provenance': [{'wikipedia_id': '29324498', 'title': 'Imagine Dragons', 'start_paragraph_id': 9, 'start_character': 73, 'end_paragraph_id': 9, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::History.:2008–2011: Early years.\n'}]}, {'provenance': [{'wikipedia_id': '29324498', 'title': 'Imagine Dragons', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 236, 'bleu_score': 0.953991849837532, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1840547185600908402}, 'section': 'Section::::History.:2008–2011: Early years.\n'}]}]