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The Silos get tagged as “roots rockers,” so it’s worth taking a look at their lineage. The band grew out of Florida acts the Vulgar Boatmen and the Bobs, and the group’s most recent outing, Laser Beam Next Door, roots some songs in jaunty organ and post-Graceland Paul Simon-ish percussion, with two sets of lyrics in Spanish (lovingly delivered by singer-guitarist Walter Salas-Humara). Most intriguingly, the Silos are touring with inventive stage equipment: “Walter is currently using a 1968 Gibson B25 acoustic rigged to…a 1948 Mack Truck 897 cubic-inch diesel,” the band’s Web site proclaims. They promise the setup’ll make babies cry, so you’d better leave the kiddies at home when the Silos take the stage with the Karl Straub Combo at 9:30 p.m. at Iota Club & Cafe, 2832 Wilson Blvd., Arlington. $12. (703) 522-8340. (Joe Dempsey)