Question: who did the vocals on mcdonald's jingle i'm loving it
[{'answer': 'Justin Timberlake', 'provenance': [{'wikipedia_id': '3283883', 'title': "I'm Lovin' It (song)", 'start_paragraph_id': 1, 'start_character': 65, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3283883', 'title': "I'm Lovin' It (song)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 154, 'bleu_score': 0.605048305722727, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5668169938599392200}, 'section': 'Section::::Abstract.'}]}]