Question: when did david coverdale play in deep purple
[{'answer': 'from 1973 to 1976', 'provenance': [{'wikipedia_id': '331582', 'title': 'David Coverdale', 'start_paragraph_id': 1, 'start_character': 209, 'end_paragraph_id': 1, 'end_character': 226, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '331582', 'title': 'David Coverdale', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 569, 'bleu_score': 0.9461462299376011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1525620265185791487}, 'section': 'Section::::Abstract.'}]}]