Question: he classical string quartet is a musical composition for
[{'answer': 'two violin players', 'provenance': [{'wikipedia_id': '65417', 'title': 'String quartet', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a viola player', 'provenance': [{'wikipedia_id': '65417', 'title': 'String quartet', 'start_paragraph_id': 1, 'start_character': 106, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a cellist', 'provenance': [{'wikipedia_id': '65417', 'title': 'String quartet', 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '65417', 'title': 'String quartet', 'start_paragraph_id': 1, 'start_character': 9, 'end_paragraph_id': 1, 'end_character': 364, 'bleu_score': 0.8520723268449211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15102038093994143762}, 'section': 'Section::::Abstract.'}]}]