Question: who sings the opening song of rocky horror
[{'answer': "Richard O'Brien", 'provenance': [{'wikipedia_id': '5615159', 'title': 'Science Fiction/Double Feature', 'start_paragraph_id': 1, 'start_character': 220, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5615159', 'title': 'Science Fiction/Double Feature', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 790, 'bleu_score': 0.9659246927162931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2430042644069168793}, 'section': 'Section::::Overview.\n'}]}]