What was the most expensive musical instrument sold?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q27680201', 'id': 0, 'label': "Riemann's Music Dictionary"}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q34379', 'id': 1, 'label': 'musical instrument'}], 'links': [{'name_': 'P1343', 'source': 1, 'target': 0, 'label': 'described by source'}]}