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While billing it as “The Best of the Underground Tour” isn’t quite accurate, tonight’s Organized Konfusion, Beatnuts, Common Sense, and Artifacts lineup should throw some sparks. Expect most of them to be generated by New York rappers Organized Konfusion. The ensemble’s latest disc, Stress, may not feature any West Coast-hiphop hooks, but it demonstrates the group’s East Coast adeptness at articulating fast-paced, flowing rhymes. Tonight at 9 p.m. at the Ibex, 5832 Georgia Ave. NW. $10. (202) 726-1800; tomorrow at 9 p.m. at the 9:30 Club, 930 F St. NW. $8. (202) 393-0930. (Steve Kiviat)