Question: where does the joshua tree get its name
[{'answer': 'Irish roots music', 'provenance': [{'wikipedia_id': '238967', 'title': 'The Joshua Tree', 'start_paragraph_id': 1, 'start_character': 415, 'end_paragraph_id': 1, 'end_character': 432, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '238967', 'title': 'The Joshua Tree', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 623, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4185601230158749148}, 'section': 'Section::::Abstract.'}]}]