SAN ANTONIO, Texas — Texas has no shortage of musical groups influenced by the norteño and conjunto music that evolved along the U.S.-Mexico border. Los Pistoleros de Texas one-ups those groups by throwing another border into the mix: the Texas-Louisiana border. The band stirs up a spicy, accordion-driven gumbo that combines the border’s traditional Tex-Mex sounds with the Gulf Coast zydeco, country and blues prevalent in its hometown of Houston. That diverse musical approach drew enthusiastic applause at the recent 2010 San Antonio International Accordion Festival, where Los Pistoleros performed in October. It’s also helped the band attract fans from across musical genres, leader Roberto Rodriguez explained.