Question: who sang the opening line of do they know it's christmas
[{'answer': 'Chris Martin', 'provenance': [{'wikipedia_id': '848102', 'title': "Do They Know It's Christmas?", 'start_paragraph_id': 22, 'start_character': 280, 'end_paragraph_id': 22, 'end_character': 292, 'bleu_score': 1.0, 'section': 'Section::::Style and content.\n'}]}, {'provenance': [{'wikipedia_id': '848102', 'title': "Do They Know It's Christmas?", 'start_paragraph_id': 170, 'start_character': 0, 'end_paragraph_id': 170, 'end_character': 595, 'bleu_score': 0.9796927878356411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14427040803944948257}, 'section': 'Section::::Band Aid 30.:Background.\n'}]}]