Question: what kind of bass does john cooper play
[{'answer': 'bass guitar', 'provenance': [{'wikipedia_id': '7474203', 'title': 'John Cooper (musician)', 'start_paragraph_id': 13, 'start_character': 191, 'end_paragraph_id': 13, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Personal life.\n'}]}]