Question: who wrote the song waiting on the world to change
[{'answer': 'John Mayer', 'provenance': [{'wikipedia_id': '7208165', 'title': 'Waiting on the World to Change', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]