Question: who sings the theme song on good times
[{'answer': 'Jim Gilstrap', 'provenance': [{'wikipedia_id': '383052', 'title': 'Good Times', 'start_paragraph_id': 71, 'start_character': 121, 'end_paragraph_id': 71, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Production notes.:Theme song and opening sequence.\n'}]}, {'answer': 'Blinky Williams', 'provenance': [{'wikipedia_id': '383052', 'title': 'Good Times', 'start_paragraph_id': 71, 'start_character': 152, 'end_paragraph_id': 71, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Production notes.:Theme song and opening sequence.\n'}]}]