Question: in which year was led zepplin refused entry into singapore because the band members had long hair
[{'answer': '1972', 'provenance': [{'wikipedia_id': '14048190', 'title': 'Led Zeppelin Australasian Tour 1972', 'start_paragraph_id': 0, 'start_character': 31, 'end_paragraph_id': 0, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14048190', 'title': 'Led Zeppelin Australasian Tour 1972', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2772881236574776450}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14048190', 'title': 'Led Zeppelin Australasian Tour 1972', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 214, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2772881236574776450}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14048190', 'title': 'Led Zeppelin Australasian Tour 1972', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["Led Zeppelin's 1972 Australasian Tour was the only concert tour of Australia and New Zealand by the English rock band. The tour commenced on 16 February and concluded on 29 February 1972. (Led Zeppelin's guitarist Jimmy Page had earlier toured Australia with The Yardbirds in January 1967). The original plan for this tour was for the group to stop off en route at Singapore for a concert on 14 February, but the local authorities refused their entry due to local laws banning males from wearing long hair. Led Zeppelin received generally", "Led Zeppelin's 1972 Australasian Tour was the only concert tour of Australia and New Zealand by the English rock band. The tour commenced on 16 February and concluded on 29 February 1972.", 'but the local authorities refused their entry due to local laws']}}]}]