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Is it gravitational force or just routine grunge that propels Maids of Gravity? On the fast ones, it seems like the latter, but this Cal Arts-formed trio led by Ed Ruscha Jr. (yup, son of the painter) is more distinctive when such astral tracks as “Introverted Skies” and “Shimmering” float beyond the earth’s pull. With God Lives Underwater at 8:30 p.m. at the 9:30 Club, 930 F St. NW. (202) 393-0930. $5. (MJ)