Question: who is the highest certified music artist in the us
[{'answer': 'The Beatles', 'provenance': [{'wikipedia_id': '1102950', 'title': 'List of highest-certified music artists in the United States', 'start_paragraph_id': 2, 'start_character': 132, 'end_paragraph_id': 2, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]