Which guitarist released the album Ballads and Blues?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q9759', 'id': 1, 'label': 'blues'}, {'type': 'INTERNAL', 'name_': 'Q202937', 'id': 2, 'label': 'Stevie Ray Vaughan'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q254792', 'id': 3, 'label': 'Ballads and Blues'}, {'type': 'INTERNAL', 'name_': 'Q5215456', 'id': 4, 'label': 'Dancing Cat Records'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q68561493', 'id': 5, 'label': 'Stevie Ray Vaughan & Double Trouble'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P27', 'source': 2, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P136', 'source': 2, 'target': 1, 'label': 'genre'}, {'name_': 'P361', 'source': 2, 'target': 5, 'label': 'part of'}, {'name_': 'P136', 'source': 3, 'target': 1, 'label': 'genre'}, {'name_': 'P264', 'source': 3, 'target': 4, 'label': 'record label'}, {'name_': 'P17', 'source': 4, 'target': 0, 'label': 'country'}, {'name_': 'P495', 'source': 5, 'target': 0, 'label': 'country of origin'}, {'name_': 'P527', 'source': 5, 'target': 2, 'label': 'has part(s)'}]}