Question: who sings the last song in pitch perfect 2
[{'answer': 'Adam DeVine', 'provenance': [{'wikipedia_id': '41890130', 'title': 'Pitch Perfect 2', 'start_paragraph_id': 1, 'start_character': 670, 'end_paragraph_id': 1, 'end_character': 681, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]