The Freiburg Baroque Orchestra can be counted on to give vibrant, probing performances. This German ensemble offers works by Mozart for its next visit to New York, including the Clarinet Concerto in A and the "Linz" Symphony. In addition, the compelling baritone Christian Gerhaher, whose performances should never be missed, sings arias from "Don Giovanni," "Cos� Fan Tutte" and "Le Nozze di Figaro."