Question: who wrote the theme song for a different world
[{'answer': 'Stu Gardner', 'provenance': [{'wikipedia_id': '589471', 'title': 'A Different World', 'start_paragraph_id': 75, 'start_character': 33, 'end_paragraph_id': 75, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Connections to "The Cosby Show".\n'}]}, {'answer': 'Bill Cosby', 'provenance': [{'wikipedia_id': '589471', 'title': 'A Different World', 'start_paragraph_id': 74, 'start_character': 23, 'end_paragraph_id': 74, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Connections to "The Cosby Show".\n'}]}, {'answer': 'Dawnn Lewis', 'provenance': [{'wikipedia_id': '589471', 'title': 'A Different World', 'start_paragraph_id': 75, 'start_character': 62, 'end_paragraph_id': 75, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Connections to "The Cosby Show".\n'}]}]