Question: who sings with john denver on fly away
[{'answer': 'Olivia Newton - John', 'provenance': [{'wikipedia_id': '18218892', 'title': 'Fly Away (John Denver song)', 'start_paragraph_id': 1, 'start_character': 83, 'end_paragraph_id': 1, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18218892', 'title': 'Fly Away (John Denver song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 381, 'bleu_score': 0.9204199807826591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18348982136711986649}, 'section': 'Section::::Abstract.'}]}]