Question: who sang lead on eye of the tiger
[{'answer': 'Dave Bickler', 'provenance': [{'wikipedia_id': '1439800', 'title': 'Eye of the Tiger', 'start_paragraph_id': 1, 'start_character': 781, 'end_paragraph_id': 1, 'end_character': 793, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1439800', 'title': 'Eye of the Tiger', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 808, 'bleu_score': 0.7201116205945881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3367707710395406444}, 'section': 'Section::::Abstract.'}]}]