Question: who wrote the theme song for that 70's show
[{'answer': 'Alex Chilton', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 39, 'start_character': 72, 'end_paragraph_id': 39, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'answer': 'Chris Bell', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 39, 'start_character': 89, 'end_paragraph_id': 39, 'end_character': 99, 'bleu_score': 1.0, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 346, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11314262836351725453}, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}]