One of the most enduring artistic expressions of multicultural contact in Texas is what is known popularly as “Tex-Mex” or “Tejano” music. The leading sub-genre of Tejano music today is “norteño” (‘northern’) or “conjunto” (‘conjoined’) music. Building on a traditional northern Mexican ballad form called “corrido,” norteño/conjunto music incorporates musical influences from German and Czech immigrants, notably the polka, and especially the use of the button accordion. One of the pioneers of the “norteño sound” was Fred Zimmerle (1931–1998), who formed the Trio San Antonio in his hometown of the same name.