Question: who did the voices of alvin and the chipmunks
[{'answer': 'Ross Bagdasarian Jr .', 'provenance': [{'wikipedia_id': '355901', 'title': 'Alvin and the Chipmunks', 'start_paragraph_id': 2, 'start_character': 595, 'end_paragraph_id': 2, 'end_character': 614, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]