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There’s a lot of creative potential to be found in the deceptively simple act of repetition. Under the moniker of Animal Hospital, Kevin Micka explores this with little more than an arsenal of effects pedals and other assorted guitar gear. Micka’s method—adding layers of loops on top of one another until a song emerges—resembles in concept a Facebook-era Frippertronics. But the songs that Animal Hospital crafts are hospitable enough so as not to require a deep technical knowledge of their experimental underpinnings. Micka’s sonic surges, usually summed up under that broad umbrella term of post-rock, range from thunderous, crushing, doom-drenched blasts to spacey, twinkling soundscapes to light, mathy riffs running in rings of recurrence. Whatever atmosphere they reflect, Animal Hospital’s songs are always evocative. Animal Hospital performs with Insect Factory and Corpus Callosum at 9:30 p.m. at the Velvet Lounge, 915 U St. NW. $7. (202) 462-3213.