Question: who wrote the song i d like to teach the world to sing in perfect harmony
[{'answer': 'Bill Backer', 'provenance': [{'wikipedia_id': '154101', 'title': "I'd Like to Teach the World to Sing (In Perfect Harmony)", 'start_paragraph_id': 4, 'start_character': 28, 'end_paragraph_id': 4, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'answer': 'Billy Davis', 'provenance': [{'wikipedia_id': '154101', 'title': "I'd Like to Teach the World to Sing (In Perfect Harmony)", 'start_paragraph_id': 1, 'start_character': 272, 'end_paragraph_id': 1, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Roger Cook', 'provenance': [{'wikipedia_id': '154101', 'title': "I'd Like to Teach the World to Sing (In Perfect Harmony)", 'start_paragraph_id': 4, 'start_character': 141, 'end_paragraph_id': 4, 'end_character': 151, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'answer': 'Roger Greenaway', 'provenance': [{'wikipedia_id': '154101', 'title': "I'd Like to Teach the World to Sing (In Perfect Harmony)", 'start_paragraph_id': 4, 'start_character': 482, 'end_paragraph_id': 4, 'end_character': 497, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}]