Question: who sang the eight is enough theme song
[{'answer': 'Grant Goodeve', 'provenance': [{'wikipedia_id': '1083821', 'title': 'Eight Is Enough', 'start_paragraph_id': 18, 'start_character': 499, 'end_paragraph_id': 18, 'end_character': 512, 'bleu_score': 1.0, 'section': 'Section::::Cast and characters.:Main.\n'}]}, {'provenance': [{'wikipedia_id': '1083821', 'title': 'Eight Is Enough', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 499, 'bleu_score': 0.9505764710553931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2371787197480544957}, 'section': 'Section::::Music.:Theme.\n'}]}]