Question: when did queen's first song come out
[{'answer': '1973', 'provenance': [{'wikipedia_id': '42010', 'title': 'Queen (band)', 'start_paragraph_id': 2, 'start_character': 331, 'end_paragraph_id': 2, 'end_character': 335, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42010', 'title': 'Queen (band)', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 714, 'bleu_score': 0.9839344367380701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12599098589197096908}, 'section': 'Section::::History.:1968–1974: Early era.\n'}]}]