Question: who sings the chorus in sing for the moment by eminem
[{'answer': 'Steven Tyler', 'provenance': [{'wikipedia_id': '2271685', 'title': 'Sing for the Moment', 'start_paragraph_id': 4, 'start_character': 162, 'end_paragraph_id': 4, 'end_character': 174, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '2271685', 'title': 'Sing for the Moment', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 544, 'bleu_score': 0.9200057007665821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4476548242129220415}, 'section': 'Section::::Background.\n'}]}]