“We was on the radio at Del Rio,” recalls one of the Cowboy Kings in Clem Maverick, R. G. Vliet’s multi-voiced epic poem about the high-lonesome lovesick rise and fall of a country-western singer. “That night Clem yodeled from his toes up. Had to tote him from the mike.” Clem and the Cowboy Kings tore up their tunes as phantoms of a poet’s muse, but their flesh, blood, and whiskey kin conjured their sound into every corner of North America and beyond. Clem’s audience would have known that “the radio at Del Rio” meant one of the high-powered radio stations that dotted the northern frontier of the Republic of Mexico and blasted their signals northward in English from 1930 to 1986. Over the course of those fifty-six years, border radio’s continent-spanning coverage played a major role in popularizing just about every kind of music that came out of Texas: hillbilly, cowboy, gospel, Mexican, Tex-Mex, country-western, blues, r&b, rockabilly, and rock & roll.