Question: who sang the theme song for national lampoon vacation
[{'answer': 'Lindsey Buckingham', 'provenance': [{'wikipedia_id': '22831408', 'title': 'Holiday Road', 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]