Question: who sings the intro for phineas and ferb
[{'answer': 'Bowling for Soup', 'provenance': [{'wikipedia_id': '23865023', 'title': 'Phineas and Ferb (soundtrack)', 'start_paragraph_id': 4, 'start_character': 71, 'end_paragraph_id': 4, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}]