FRIDAY, JULY 6 The Shakes, The Centimeters, Spooky Pie at Mr. T's Bowl. Sometimes only a genius can recognize another genius. Leave it to the Shakes, who've whipped up so many delicious garage-pop confections of their own, to rescue the inner song buried in Britney Spears' mechanized, overly produced hit single "Oops! . . . I Did It Again." Combining the original's maddeningly insidious melody with a '60s fop-rock arrangement cleverly cribbed from the Kinks' "Sunny Afternoon," Shakes lead singer Pete Gilabert and bassist-vocalist Janet Housden (ex-Redd Kross, the Excessories) have concocted a transcendently ephemeral, pure-pop guilty pleasure on their new demo CD. Speaking of transcendence, charismatic, wide-eyed chanteuse Nora Keyes imbues the Centimeters'inherently wacky cabaret synth-pop with a fortune teller's gaudy mysticism and faux exoticism, while Spooky Pie's Miriam Jacobson, a Weekly staffer, gives the Beatles' "Hey Bulldog" an austere, revenge-of-Karen-Silkwood-keening-over-the-windswept-and-irradiated-Oklaho ma-plains haunting reinterpretation. This show's a benefit to save the estimable teeth of W.A.C.O.'s Rebecca Lynn, which gives you the chance to be a new Medici, a patron of the arts.(Falling James)