Question: who is lead singer of greta van fleet
[{'answer': 'Josh Kiszka', 'provenance': [{'wikipedia_id': '53890868', 'title': 'Greta Van Fleet', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53890868', 'title': 'Greta Van Fleet', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 653, 'bleu_score': 0.5664898799857501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10416630423685331569}, 'section': 'Section::::Abstract.'}]}]