Question: who sings the opening to sunday night football
[{'answer': 'Carrie Underwood', 'provenance': [{'wikipedia_id': '3613092', 'title': 'NBC Sunday Night Football', 'start_paragraph_id': 63, 'start_character': 721, 'end_paragraph_id': 63, 'end_character': 737, 'bleu_score': 1.0, 'section': 'Section::::Scheduling.:2010s.:2014.\n'}]}]