Question: who sings with jackson brown on the load out
[{'answer': 'Rosemary Butler', 'provenance': [{'wikipedia_id': '12437518', 'title': 'The Load-Out', 'start_paragraph_id': 3, 'start_character': 453, 'end_paragraph_id': 3, 'end_character': 468, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'David Lindley', 'provenance': [{'wikipedia_id': '12437518', 'title': 'The Load-Out', 'start_paragraph_id': 3, 'start_character': 229, 'end_paragraph_id': 3, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '12437518', 'title': 'The Load-Out', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 519, 'bleu_score': 0.960196138847988, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6940478441103204453}, 'section': 'Section::::History.\n'}]}]