Both virtuosic guitarists, Louisiana’s Sonny Landreth and New York’s Cindy Cashdollar are performing a few rare duo shows that should be rife with mind-blowing technique, fiery solos, intricate interplay, and a forest of American roots music. Landreth is a slide monster with an idiosyncratic style that combines slide and fretwork, creating a multifaceted sound venturing from the bayous to blues, jazz-rock, and beyond. Cashdollar, a longtime member of Asleep at the Wheel, is a master of resonator and steel guitar, focusing on bluegrass, blues, and Texas swing. But really, like Landreth, she’s in high demand to play with a who’s who of roots and rock greats. Their repertoire promises a mix of originals and roots standards, and probably several tunes from Landreth’s terrific latest album,Bound by the Blues. As always, Landreth works in subtle zydeco references and improvises like a jazzbo with his guitar on fire. Speaking of flames, one original, “Firebird Blues,” is a slow, incendiary tribute to his late friend and fellow guitar wizard Johnny Winter.