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“Repeat! repeat!” chants Matthew Kilcoyne on “High Horse,” a song from My Life in Rain’s new Slowburn—as if Patrick Cusack’s guitar needs the prompting. Bristling, scraping, fidgeting, oscillating, the post-harDCore quartet’s music is a contained explosion. With Lotion and Mini King at 9:30 p.m. at the Black Cat, 1831 14th St. NW. $6. (202) 667-7960. (MJ)