Question: who did stevie wonder sing happy birthday to
[{'answer': 'Martin Luther King , Jr.', 'provenance': [{'wikipedia_id': '1452401', 'title': 'Happy Birthday (Stevie Wonder song)', 'start_paragraph_id': 4, 'start_character': 286, 'end_paragraph_id': 4, 'end_character': 313, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '1452401', 'title': 'Happy Birthday (Stevie Wonder song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 393, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12105932516812731193}, 'section': 'Section::::Abstract.'}]}]