Question: who sang vocals on hypnotized by fleetwood mac
[{'answer': 'Bob Welch', 'provenance': [{'wikipedia_id': '24378865', 'title': 'Hypnotized (Fleetwood Mac song)', 'start_paragraph_id': 1, 'start_character': 34, 'end_paragraph_id': 1, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bob Weston', 'provenance': [{'wikipedia_id': '24378865', 'title': 'Hypnotized (Fleetwood Mac song)', 'start_paragraph_id': 3, 'start_character': 358, 'end_paragraph_id': 3, 'end_character': 368, 'bleu_score': 1.0, 'section': 'Section::::Background and style.\n'}]}, {'answer': 'Christine McVie', 'provenance': [{'wikipedia_id': '24378865', 'title': 'Hypnotized (Fleetwood Mac song)', 'start_paragraph_id': 13, 'start_character': 12, 'end_paragraph_id': 13, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}]