Question: what pop groups music was used in the movie saturday night fever
[{'answer': 'Bee Gees', 'provenance': [{'wikipedia_id': '194671', 'title': 'Saturday Night Fever (soundtrack)', 'start_paragraph_id': 4, 'start_character': 4, 'end_paragraph_id': 4, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Writing and recording.\n'}]}]