Question: who sings once i was seven years old
[{'answer': 'Lukas Graham', 'provenance': [{'wikipedia_id': '47457972', 'title': '7 Years (Lukas Graham song)', 'start_paragraph_id': 0, 'start_character': 9, 'end_paragraph_id': 0, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47457972', 'title': '7 Years (Lukas Graham song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 306, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1458275005768783128}, 'section': 'Section::::Abstract.'}]}]