Question: who wrote a song for you leon russell or donny hathaway
[{'answer': 'Leon Russell', 'provenance': [{'wikipedia_id': '1205055', 'title': 'A Song for You', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 98, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1205055', 'title': 'A Song for You', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 466, 'bleu_score': 0.7446510052769331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13411688150874103052}, 'section': 'Section::::Abstract.'}]}]