Who was Duke Ellington's first drummer?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q4030', 'id': 0, 'label': 'Duke Ellington'}, {'type': 'INTERNAL', 'name_': 'Q18711010', 'id': 1, 'label': 'Santa Claus, Bring My Man Back To Me'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q1260845', 'id': 2, 'label': 'Sonny Greer'}], 'links': [{'name_': 'P175', 'source': 1, 'target': 0, 'label': 'performer'}, {'name_': 'P175', 'source': 1, 'target': 2, 'label': 'performer'}]}