Question: which type of music popularized by bob marley
[{'answer': 'Roots reggae', 'provenance': [{'wikipedia_id': '1014616', 'title': 'Reggae genres', 'start_paragraph_id': 13, 'start_character': 11, 'end_paragraph_id': 13, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Early reggae.\n'}]}, {'provenance': [{'wikipedia_id': '1014616', 'title': 'Reggae genres', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 1020, 'bleu_score': 0.9877670085238551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5783841132687817635}, 'section': 'Section::::Roots reggae.\n'}]}]