It’s almost impossible to nail down what Alejandro Escovedo will do next. From his first appearance on “Austin City Limits” in 1983 as a guitarist with cowpunk band Rank and File, to his next one nearly 20 years later performing a musical-theater folk tale centered on Mexican-American themes, to subsequent solo episodes featuring chamber-rock lineups from his Austin heyday, he’s been a constant chameleon.
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