Question: who was the original lead singer for deep purple
[{'answer': 'Rod Evans', 'provenance': [{'wikipedia_id': '45848', 'title': 'Deep Purple', 'start_paragraph_id': 2, 'start_character': 571, 'end_paragraph_id': 2, 'end_character': 580, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45848', 'title': 'Deep Purple', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 892, 'bleu_score': 0.8882894830933951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15776219528844082023}, 'section': 'Section::::History.:Beginnings (1967–1968).\n'}]}]