Question: who sang ghost riders in the sky originally
[{'answer': 'Burl Ives', 'provenance': [{'wikipedia_id': '3029218', 'title': '(Ghost) Riders in the Sky: A Cowboy Legend', 'start_paragraph_id': 5, 'start_character': 282, 'end_paragraph_id': 5, 'end_character': 291, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}]