Los Lobos: La Pistola y El Corazon

THE DIFFERENCE between Linda Ronstadt's recent album of Mexican folk standards and Los Lobos' new album of Mexican folk standards, La Pistola y El Corazon, is the difference between a Linda Ronstadt album of jazz standards and a Betty Carter album of jazz standards. It's the difference between a Ronstadt greatest hits collection of rock oldies and a Bruce Springsteen concert encore of rock oldies; it's the difference between a slick folkloric show for tourists and a Saturday night dance in the barrio. It's the difference between night and day.