Question: who sings vocals on don t you worry child
[{'answer': 'John Martin', 'provenance': [{'wikipedia_id': '36689322', 'title': "Don't You Worry Child", 'start_paragraph_id': 1, 'start_character': 212, 'end_paragraph_id': 1, 'end_character': 223, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '36689322', 'title': "Don't You Worry Child", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 549, 'bleu_score': 0.943950247594541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 959956241695012391}, 'section': 'Section::::Abstract.'}]}]