Question: who sang lead vocal on one of these nights
[{'answer': 'Don Henley', 'provenance': [{'wikipedia_id': '6269716', 'title': 'One of These Nights (song)', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6269716', 'title': 'One of These Nights (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 712, 'bleu_score': 0.9846731957240711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13035848751688629828}, 'section': 'Section::::Abstract.'}]}]