Question: who sings with john mayer on who you love
[{'answer': 'Katy Perry', 'provenance': [{'wikipedia_id': '40945190', 'title': 'Who You Love', 'start_paragraph_id': 1, 'start_character': 49, 'end_paragraph_id': 1, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40945190', 'title': 'Who You Love', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 531, 'bleu_score': 0.8634928472418201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10728198471568611728}, 'section': 'Section::::Abstract.'}]}]