Question: who sings the song if you leave me now
[{'answer': 'Chicago', 'provenance': [{'wikipedia_id': '1113983', 'title': 'If You Leave Me Now', 'start_paragraph_id': 1, 'start_character': 78, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]