Question: who sang the original version of mad world
[{'answer': 'Curt Smith', 'provenance': [{'wikipedia_id': '1621949', 'title': 'Mad World', 'start_paragraph_id': 1, 'start_character': 110, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1621949', 'title': 'Mad World', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 346, 'bleu_score': 0.9699161750394991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17841527442285592767}, 'section': 'Section::::Abstract.'}]}]