Question: what key is faded by alan walker in
[{'answer': 'E ♭ minor'}, {'provenance': [{'wikipedia_id': '49031279', 'title': 'Faded (Alan Walker song)', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 158, 'bleu_score': 0.716059728388945, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 387771867940735447}, 'section': 'Section::::Background.\n'}]}]