Question: what kind of music do the avett brothers play
[{'answer': 'Folk', 'provenance': [{'wikipedia_id': '1800015', 'title': 'The Avett Brothers', 'start_paragraph_id': 23, 'start_character': 159, 'end_paragraph_id': 23, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::History.:"The Carpenter" and "Magpie and the Dandelion" (2012-2015).\n'}]}, {'answer': 'folk rock', 'provenance': [{'wikipedia_id': '1800015', 'title': 'The Avett Brothers', 'start_paragraph_id': 1, 'start_character': 35, 'end_paragraph_id': 1, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'indie folk'}, {'answer': 'bluegrass', 'provenance': [{'wikipedia_id': '1800015', 'title': 'The Avett Brothers', 'start_paragraph_id': 2, 'start_character': 85, 'end_paragraph_id': 2, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Americana', 'provenance': [{'wikipedia_id': '1800015', 'title': 'The Avett Brothers', 'start_paragraph_id': 15, 'start_character': 24, 'end_paragraph_id': 15, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::History.:"Emotionalism" (2007-2008).\n'}]}]