Question: who sang background vocals on my sweet lord
[{'answer': 'Bobby Whitlock', 'provenance': [{'wikipedia_id': '1117235', 'title': 'My Sweet Lord', 'start_paragraph_id': 86, 'start_character': 12, 'end_paragraph_id': 86, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}]