Question: who sang the theme song to petticoat junction
[{'answer': 'Curt Massey', 'provenance': [{'wikipedia_id': '747234', 'title': 'Petticoat Junction', 'start_paragraph_id': 97, 'start_character': 0, 'end_paragraph_id': 97, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Theme song.\n'}]}, {'provenance': [{'wikipedia_id': '747234', 'title': 'Petticoat Junction', 'start_paragraph_id': 97, 'start_character': 0, 'end_paragraph_id': 97, 'end_character': 172, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14247612681395239559}, 'section': 'Section::::Theme song.\n'}]}]