There are (at least) two notable things about Merrill Garbus: The Connecticut native makes cool music as tUnE-yArDs and she capitalizes letters as she pleases. Her debut album, BiRd-BrAiNs, the lowest of lo-fi folk, was recorded through a handheld digital voice recorder and released as a pay-what-you-please download. And when performing live, Garbus makes drum loops onstage that she layers with ukulele, her soulful voice and Nate Brenner’s bass. The second tUnE-yArDs disc, w h o k i l l, having been recorded in a studio, is a more polished affair that covers a wider musical terrain—Afro beat, folk, funk, jazz, R&B and rock. But the way to truly experience tUnE-yArDs (above, playing “Bizness” at this year’s Coachella) is live, which you can do on Friday night at Terminal 5.