Question: who sang it's your letters on tfi friday
[{'answer': 'Coldplay', 'provenance': [{'wikipedia_id': '2042605', 'title': 'TFI Friday', 'start_paragraph_id': 162, 'start_character': 73, 'end_paragraph_id': 162, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Regular features.:2015 series.\n'}]}, {'provenance': [{'wikipedia_id': '2042605', 'title': 'TFI Friday', 'start_paragraph_id': 162, 'start_character': 0, 'end_paragraph_id': 162, 'end_character': 119, 'bleu_score': 0.8970773746801091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9203711372751039748}, 'section': 'Section::::Regular features.:2015 series.\n'}]}]