Question: when did childish gambino release his first song
[{'answer': '2011', 'provenance': [{'wikipedia_id': '37543978', 'title': 'Childish Gambino discography', 'start_paragraph_id': 1, 'start_character': 237, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]