Question: who wrote the song billy don't be a hero
[{'answer': 'Mitch Murray', 'provenance': [{'wikipedia_id': '2622356', 'title': "Billy Don't Be a Hero", 'start_paragraph_id': 1, 'start_character': 217, 'end_paragraph_id': 1, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Peter Callander', 'provenance': [{'wikipedia_id': '2622356', 'title': "Billy Don't Be a Hero", 'start_paragraph_id': 1, 'start_character': 234, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2622356', 'title': "Billy Don't Be a Hero", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12216067646708490644}, 'section': 'Section::::Abstract.'}]}]