Question: who sang the song leader of the band
[{'answer': 'Dan Fogelberg', 'provenance': [{'wikipedia_id': '9488861', 'title': 'Leader of the Band', 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9488861', 'title': 'Leader of the Band', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 404, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16679128570920629739}, 'section': 'Section::::Abstract.'}]}]