Question: who is the lead singer in i prevail
[{'answer': 'Brian Burkheiser', 'provenance': [{'wikipedia_id': '46911300', 'title': 'I Prevail', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::History.:"Lifelines" and touring (2016–2019).\n'}]}]