Question: who was the original singer for killswitch engage
[{'answer': 'Jesse Leach', 'provenance': [{'wikipedia_id': '212907', 'title': 'Killswitch Engage', 'start_paragraph_id': 1, 'start_character': 199, 'end_paragraph_id': 1, 'end_character': 210, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '212907', 'title': 'Killswitch Engage', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 724, 'bleu_score': 0.9373498622748081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9989875341351086651}, 'section': 'Section::::History.:Early years and debut album (1999–2001).\n'}]}]