Question: who sings the song because i'm happy
[{'answer': 'Pharrell Williams', 'provenance': [{'wikipedia_id': '41170737', 'title': 'Happy (Pharrell Williams song)', 'start_paragraph_id': 0, 'start_character': 7, 'end_paragraph_id': 0, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]