According to author Elijah Wald, there have been public cries to ban narcocorridos, or Mexican drug ballads, in Mexico since the '70s. Baja California jumped on the bandwagon with a voluntary ban in 2002. Even Arizona has considered a radio ban on narcos. Yeah, good luck with that. Often talked about as the cousin to gangsta rap, narcos hide on the shelves of most Latino stores, behind polic?a-friendly Shakira and Enrique Iglesias CDs. Discoteca de Joyas Musicales doesn't play that game. A glance at the rack offers hard-core narcos from two of the most popular players in the genre, Reynaldo Martinez and Los Tigres del Norte. If you don't speak espa?ol, you'd better learn some before you shop here. Basic phrases like "how much is this" and "where can I find" are pretty much all you need to know. But for heaven's sake, don't go asking for "Mexican drug music" unless you'd like to get up close and personal with a pistola.