Little Rachel plays the Tractor Tavern tonight as part of the KEXP Shake the Shack Rockabilly FestivalTonight:The Blue Scholars, Hieroglyphics, Musab, Prince Ali, Tanya Morgan, Showbox at the Market, 8 p.m., $18 adv, $20 dos Friday AND Saturday nights, all ages (both nights)Two shows: tonight and tomorrow. A good chance to see Seattle’s most deservedly popular independent hip hop outfit and Pep Love, Souls of Mischief and Casual. No, Del will not be there. Sorry kids. And as of this writing, neither show is sold out. Yet. I’ll try and let ya’ll know if that changes.. KEXP Shake the Shack Rockabilly Festival feat. James Intveld, Rocky Velvet, Little Rachel, the Royal Deuces, Tractor Tavern, $18, 8 p.m.I just really dig Austin country chanteuse Little Rachel’s voice. I could yammer about why I like it, or you could just listen on her webpage and see if you agree.Calexico, the Cave Singers, Moore Theatre, 8 p.m., $20, all agesCourtesy of Jonathan Hiskes:Imagine our southern border without concrete walls, coyotes, and Minutemen vigilante patrols. Imagine John McCain still believed in realistic immigration policy. Imagine music free to traverse this open landscape (it’s easy if you try), drawing mariachi blasts from the south and pedal steel cries from the north, and you get a sense of Calexico’s sound. This border hopping gives the Tucson band an impressive range. The core duo of singer-stringer Joey Burns and percussionist John Convertino works with an oft-shifting cast that adds harmonica, trumpet, cello and glockenspiel. They proved their alt-folkie acoustic chops collaborating with Iron and Wine a few years ago and returned to their signature Americana-meet-Tejano rock sound on this month’s “Carried to Dust,” conceived as a Southwestern travelogue. Unlike your average “Mexican” fry pit serving up burritos and chimichangas and calling them authentic, Calexico embraces its border country home. And, yes, horns in rock ‘n roll can be a dangerous gambit. These guys do it right.The Corner feat. Indijinis, Dimmak, Alpha-P, Neema (Unexpected Arrival), Mr. Hill, Jewelbox/Rendezvous, 10 p.m., $5I wrote this in Short List this week:If your first exposure to Seattle-based, Indianapolis-born emcee Indijinis is his song “The Stand,” you might be surprised to learn that he spent seven years in the U.S. Marine Corps. That song starts thusly: “The military industrial complex/Who the fuck you gonna bomb next?” Political? Just a touch. But if a person who’s been in the service hasn’t earned the right to speak about its flaws, no one has. Plus, while he was in the service, Indijinis lived all over the place: in Paris, in Mexico City, in San Salvador and El Salvador. Which might explain his ferocious commentary on immigration, not to mention those insane segues into rapid-fire, impeccable Spanish (or at least, it sounds that way to my pasty French-speaking self). And because Indijinis doesn’t have much of an online presence, and no way to buy his albums unless you go to a show, you should attend the Corner tonight. Not only will you feel good about supporting grassroots artists and see some of Seattle’s fine up-and-coming emcees (because that’s what the Corner’s about, after all), you can save the 18-20 bucks you would’ve spent on the Blue Scholars/Hieroglyphics show. Or go Saturday. You know, whatever.