Question: who is the most selling music artist of all time
[{'answer': 'The Beatles', 'provenance': [{'wikipedia_id': '1291598', 'title': 'List of best-selling music artists', 'start_paragraph_id': 1, 'start_character': 837, 'end_paragraph_id': 1, 'end_character': 848, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1291598', 'title': 'List of best-selling music artists', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1055, 'bleu_score': 0.9626851899038971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10334885004744557780}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57740729', 'title': 'Record sales', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Although precise worldwide sales figure is hard to obtain, it is widely acknowledged that the Beatles have sold more records than any other artist in the history of recorded music.', 't is widely acknowledged that the Beatles have sold more records than any other artist in the history of recorded music.', 'Although precise worldwide sales figure is hard to obtain, it is widely acknowledged that the Beatles have sold more records than any other artist in the history of recorded music.']}}]}, {'provenance': [{'wikipedia_id': '1291598', 'title': 'List of best-selling music artists', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Beatles are considered the highest-selling band. Elvis Presley is considered the highest-selling individual artist based on sales claims and Rihanna is the highest-selling individual artist based on certified units.', 'The Beatles are considered the highest-selling band. Elvis Presley is considered the highest-selling individual artist based on sales claims and Rihanna is the highest-selling individual artist based on certified units.', 'The Beatles are considered the highest-selling band.']}}]}]