They’re baaaack.      After an initial trial last year, the Ravinia Festival is once again using giant video screens for every Chicago Symphony Orchestra concert in its pavilion this season. Two 12-by16-foot screens flank the stage, giving listeners in Ravinia’s 4,000-seat pavilion an up-close-and-personal glimpse of the performers from percussion section to guest soloists.      In a recent evening of resplendent Wagner with Ravinia’s Music ...

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