http://edition.cnn.com/2009/CRIME/08/31/california.missing.girl/
Garrido told Karunaratne that he had a soundproof recording studio in the backyard, said Karunaratne, who described Garrido's music as "Christian, contemporary" and said some songs "were about love and romance.
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He was also listed as "a musician" in the articles about the rape of the victim that he was actually convicted for. And there are pics of a younger Garrido standing at a mike and brandishing a guitar in a rock star pose that were in a frame in "the compound" - seen in those unauthorized photos. Further there
was an interview somewhere with a guy who did some of the soundproofing for him, and a guy who had at some point been shown the soundproofing to see what he thought? I don't have links for those though, sorry.