Question: when did kenny join panic at the disco
[{'answer': '2015', 'provenance': [{'wikipedia_id': '2893218', 'title': 'Panic! at the Disco', 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2893218', 'title': 'Panic! at the Disco', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 771, 'bleu_score': 0.766810256402762, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4563336609513290407}, 'section': 'Section::::Abstract.'}]}]