In keeping with its reputation for size and spectacle, Texas has produced a staggering number of stars. Although many hailed from towns too small to have a post office, they occupied the spotlight on the largest of stages. Roger Miller's songs made him the King of the Road, and Howard Hughes stretched his vision across the skies of the silver screen. Gene Autry won fame as a singing cowboy and Van Cliburn wore a tuxedo to international piano competitions,...