Question: who sang vocals on great gig in the sky
[{'answer': 'Clare Torry', 'provenance': [{'wikipedia_id': '572011', 'title': 'The Great Gig in the Sky', 'start_paragraph_id': 1, 'start_character': 210, 'end_paragraph_id': 1, 'end_character': 221, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '572011', 'title': 'The Great Gig in the Sky', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 496, 'bleu_score': 0.591651097093007, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6722941972104346374}, 'section': "Section::::Clare Torry's vocals.\n"}]}]