Question: who wrote the songs for the nightmare before christmas
[{'answer': 'Danny Elfman', 'provenance': [{'wikipedia_id': '13901659', 'title': 'The Nightmare Before Christmas (soundtrack)', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 98, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]