Question: who performed at the champions league final 2018
[{'answer': 'English singer Dua Lipa', 'provenance': [{'wikipedia_id': '51615375', 'title': '2018 UEFA Champions League Final', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Pre-match.:Opening ceremony.\n'}]}, {'answer': 'Jamaican rapper Sean Paul', 'provenance': [{'wikipedia_id': '51615375', 'title': '2018 UEFA Champions League Final', 'start_paragraph_id': 20, 'start_character': 79, 'end_paragraph_id': 20, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Pre-match.:Opening ceremony.\n'}]}, {'provenance': [{'wikipedia_id': '51615375', 'title': '2018 UEFA Champions League Final', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 179, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9576631300323388054}, 'section': 'Section::::Pre-match.:Opening ceremony.\n'}]}]