Question: who was the original singer of the song one tin soldier
[{'answer': 'The Original Caste', 'provenance': [{'wikipedia_id': '1904515', 'title': 'One Tin Soldier', 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]