Teen icons-in-training get close to fans at Taste If they were any more famous, Alyson Michalka and Amanda Joy Michalka -- better known as Aly and A.J. -- might have caused a riot Sunday at the final concert at Taste of Chicago. After about half of the sun-baked crowd at the Petrillo Music Shell in Grant Park had cleared out toward the end of their 12-song set, the duo invited their fans to rush toward the front of the stage, which they did with teenage fervor.