Question: who did vocals for wake me up avicii
[{'answer': 'Aloe Blacc', 'provenance': [{'wikipedia_id': '39700576', 'title': 'Wake Me Up (Avicii song)', 'start_paragraph_id': 1, 'start_character': 286, 'end_paragraph_id': 1, 'end_character': 296, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39700576', 'title': 'Wake Me Up (Avicii song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 893, 'bleu_score': 0.9341008399435681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14410973323010693738}, 'section': 'Section::::Abstract.'}]}]