Question: who does the vocals on money by pink floyd
[{'answer': 'David Gilmour', 'provenance': [{'wikipedia_id': '624998', 'title': 'Money (Pink Floyd song)', 'start_paragraph_id': 4, 'start_character': 26, 'end_paragraph_id': 4, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Composition.\n'}]}]