Question: what genre of music is mac the knife
[{'answer': 'Moritat', 'provenance': [{'wikipedia_id': '285475', 'title': 'Mack the Knife', 'start_paragraph_id': 1, 'start_character': 5, 'end_paragraph_id': 1, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]