Few artists personify the spirit of Texas like Guy Clark, and he brought his best to his 1989 appearance on Austin City Limits. Appearing with a pared-down band — featuring only Stuart Duncan on fiddle and mandolin and Edgar Meyer on bass — Clark homes in on the essential qualities of the long-running program: looseness, warmth and intimacy. While some performers shrivel in this naked setting, Clark has never appeared more at home. “New Cut Road,” “Homegrown Tomatoes,” and “Texas Cookin’” have the casual, lived-in swing of a back-porch picking session, while the lyrical instrumentation brings out the elegance in “Old Friends,” “Come From the Heart” and “Better Days.” “L.A. Freeway” and “Desperadoes Waiting for a Train” are two of Clark’s oldest and most-played tunes, but here they are made new. For the occasion Clark brushed away the grit he loves to leave in the cracks of his songs, and instead played them with a newfound gentleness, as if shaking the hand of a friend he might never see again. The bittersweet undercurrent of this concert peaks on Townes Van Zandt’s “To Live Is To Fly,” one of Clark’s favorite songs — his delivery here brings tears.