Question: who wrote the song all about that bass
[{'answer': 'Meghan Trainor', 'provenance': [{'wikipedia_id': '43359294', 'title': 'All About That Bass', 'start_paragraph_id': 1, 'start_character': 72, 'end_paragraph_id': 1, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Kevin Kadish', 'provenance': [{'wikipedia_id': '43359294', 'title': 'All About That Bass', 'start_paragraph_id': 1, 'start_character': 278, 'end_paragraph_id': 1, 'end_character': 290, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]