Question: who wrote the sons of anarchy theme song
[{'answer': 'singer - songwriter Curtis Stigers', 'provenance': [{'wikipedia_id': '27214589', 'title': 'This Life (song)', 'start_paragraph_id': 1, 'start_character': 89, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Velvet Revolver guitarist Dave Kushner', 'provenance': [{'wikipedia_id': '27214589', 'title': 'This Life (song)', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'producer Bob Thiele Jr.', 'provenance': [{'wikipedia_id': '27214589', 'title': 'This Life (song)', 'start_paragraph_id': 1, 'start_character': 163, 'end_paragraph_id': 1, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'show creator Kurt Sutter', 'provenance': [{'wikipedia_id': '27214589', 'title': 'This Life (song)', 'start_paragraph_id': 1, 'start_character': 191, 'end_paragraph_id': 1, 'end_character': 215, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27214589', 'title': 'This Life (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 277, 'bleu_score': 0.955027111100031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12979740333075414054}, 'section': 'Section::::Abstract.'}]}]