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Some advice for anyone attending tonight’s Oasis show: Bring an extra shoe. When the Brothers Gallagher last toured the states, the world was drooling over the boys’ drug-fueled sibling rivalry and radio stations were spinning “Wonderwall” and “Champagne Supernova” with little fear of overkill. Rumor had it that the spoiled ones, on nights they didn’t wanna rock, would plant a stagehand in the audience to hurl a shoe stageward and give the group reason to split early. But that was then. Oasis’ third effort, Be Here Now, is a bloated bag of crap—not to mention a commercial failure—compared with its often brilliant predecessor, What’s the Story (Morning Glory)?. Recent concerts have reportedly been apathetic and dull, the boys just not giving a shit about their downward spiral. How sad: A few years ago, you never wanted Oasis to stop; this evening, a spare Ked just might be necessary. With Cornershop at 8 p.m. at George Mason University’s Patriot Center, 4400 University Dr., Fairfax. $25. (703) 993-3000. (Sean Daly)