Question: who sang must be the season of the witch
[{'answer': 'Donovan', 'provenance': [{'wikipedia_id': '13216454', 'title': 'Season of the Witch (song)', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13216454', 'title': 'Season of the Witch (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 216, 'bleu_score': 0.687535900587091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4390365730996254332}, 'section': 'Section::::Abstract.'}]}]