Question: who sings final song on beauty and the beast
[{'answer': 'Josh Groban', 'provenance': [{'wikipedia_id': '52926144', 'title': 'Beauty and the Beast (2017 soundtrack)', 'start_paragraph_id': 4, 'start_character': 184, 'end_paragraph_id': 4, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Track listing.\n'}]}]