Question: who wrote the music and lyrics to west side story
[{'answer': 'music by Leonard Bernstein', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 1, 'start_character': 59, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'lyrics by Stephen Sondheim', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 1, 'start_character': 90, 'end_paragraph_id': 1, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 181, 'bleu_score': 0.6176324097551581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13066696318059051628}, 'section': 'Section::::Abstract.'}]}]