Question: who wrote the songs for wizard of oz
[{'answer': 'Harold Arlen', 'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 4, 'start_character': 291, 'end_paragraph_id': 4, 'end_character': 303, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': "Edgar `` Yip '' Harburg"}, {'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 381, 'bleu_score': 0.6866329160414211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17159104322083551334}, 'section': 'Section::::Abstract.'}]}]