Question: who sang lead on more than a feeling
[{'answer': 'Brad Delp', 'provenance': [{'wikipedia_id': '1124650', 'title': 'More Than a Feeling', 'start_paragraph_id': 50, 'start_character': 12, 'end_paragraph_id': 50, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}]