When your pop career dries up, the answer seems to be "make a mariachi album." It worked for Castro -- El Indomable garnered a Grammy nomination in 2008. But put away your self-satisfied guffaws -- Castro's album has great moments when he provides a textured, marvelously sensitive rendering of this iconic Mexican music. On many songs the violins float like gauze and the horns seem to be cloaked in muslin, and Castro's duet with Vicente Fernandez is note-perfect. Castro can't hold a candle to the greats, but for a washed-up pop star he does all right.