Photographers like to say that their medium's closest artistic equivalent is music. That assertion has more to do with their fondness for tunes -- many of them are frustrated musicians -- than with any critical rationale. But if any photographer's work bears comparison to music, the most abstract of all the arts, it is Pete Turner's. In Turner's highly graphic, supersaturated images, color and form are analogous to pitch and meter, and almost disembodied from physical substance -- like music, pure wavelengths of energy.