Question: who has the entertainers been in the past three super bowl games
[{'answer': 'Lady Gaga', 'provenance': [{'wikipedia_id': '1730307', 'title': 'List of Super Bowl halftime shows', 'start_paragraph_id': 1, 'start_character': 758, 'end_paragraph_id': 1, 'end_character': 767, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Coldplay'}, {'answer': 'Beyoncé'}, {'answer': 'Bruno Mars'}, {'answer': 'Mark Ronson'}, {'answer': 'Gustavo Dudamel'}, {'answer': 'Justin Timberlake and the Tennessee Kids'}]