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It all started with the notion of releasing six 7-inch singles whose thematically linked cover art honored the simple mechanisms (lever, pulley, wedge, etc.) that make everything mechanical work. Now, only four years later, Simple Machines is mounting “The Simple Machines 50th Release Anniversary Festival,” the label’s second big shindig in less than a year. The lineup features label favorites ranging from the new all-star group A June of 44 (featuring former members of Rodan, Hoover, and Codeine) to the temporarily reformed Flower (which boasts members of Versus) to Grenadine (an indie-pop supergroup featuring Tsunami’s Jenny Toomey, Air Miami’s Mark Robinson, and Eggs’ Rob Christiansen). Picked to click: the superb folk duo Ida (pictured), whose soaring melodies and expertly strummed guitar lines recall Red House Painters and Nick Drake. The festival also includes performances by Scrawl, Ruby Falls, Secret Stars, Raymond Brake, Tuff Skool, Slack, and Danielle Howle. At 8:30 p.m. Sunday through Tuesday at the Black Cat, 1831 14th St. NW. $6 each or $15 for all three shows. (202) 667-7960. (Chip Porter)