Question: when was a whiter shade of pale released
[{'answer': '12 May 1967', 'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'start_paragraph_id': 1, 'start_character': 93, 'end_paragraph_id': 1, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 450, 'bleu_score': 0.9045335012919171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4828798210557868426}, 'section': 'Section::::Abstract.'}]}]