Question: who sang the rains of castamere on game of thrones
[{'answer': 'Matt Berninger', 'provenance': [{'wikipedia_id': '51282930', 'title': 'The Rains of Castamere (song)', 'start_paragraph_id': 4, 'start_character': 584, 'end_paragraph_id': 4, 'end_character': 598, 'bleu_score': 1.0, 'section': 'Section::::Appearances.\n'}]}, {'provenance': [{'wikipedia_id': '51282930', 'title': 'The Rains of Castamere (song)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 893, 'bleu_score': 0.7446378691739941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5118077182846150586}, 'section': 'Section::::Appearances.\n'}]}]