San Antonio’s Los Texmaniacs, an outstanding Tex-Mex quartet, perpetuate several rich legacies while enthusiastically forging their own. Their roots are in conjunto, the Rio Grande Valley-bred blend of traditional Mexican music and the polka beat of German and Czech immigrants; Tejano, which factored in jazz and pop; and subsequent rock, country, and blues-influenced bands like Sir Douglas Quintet and Texas Tornados. Texmaniacs leader and bajo sexto ace Max Baca was a protégé of iconic accordionist and Tex-Mex innovator Flaco Jiménez (who at 78 still plays with Los Maniacs at times) and toured with the Tornados. The band put on a terrific show last year at the Minnesota State Fair, instigating a festive South Texas party at the Bandshell with a characteristically diverse, cross-genre repertoire, fueled by nephew Josh Baca’s accordion and the resilient rhythms of bassist Noel Hernandez and drummer Lorenzo Martinez. Live, expect Baca originals from LTM’s all-star-laden (Joe Ely, David Hidalgo, Augie Meyers) Americano Groove, conjunto classics, and Sir Doug and Tornados covers.