Question: who did def leppard tour with in 1981
[{'answer': 'Motörhead', 'provenance': [{'wikipedia_id': '23563645', 'title': 'Blizzard of Ozz Tour', 'start_paragraph_id': 11, 'start_character': 362, 'end_paragraph_id': 11, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Overview.:North America leg.\n'}]}, {'provenance': [{'wikipedia_id': '23563645', 'title': 'Blizzard of Ozz Tour', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 696, 'bleu_score': 0.956395733639637, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17136018250101237430}, 'section': 'Section::::Overview.:North America leg.\n'}]}]