Question: who originally sang deep in the heart of texas
[{'answer': 'Perry Como', 'provenance': [{'wikipedia_id': '4168755', 'title': 'Deep in the Heart of Texas', 'start_paragraph_id': 8, 'start_character': 50, 'end_paragraph_id': 8, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Notable recordings.:1942 chart recordings.\n'}]}]