When Jack's latest violin lesson causes Professor LeBlanc to attempt suicide, Jack becomes depressed. Rochester comes up with a scheme to boost Jack's confidence: he tricks Jack into thinking that music being played by Isaac Stern (who's hiding in the closet) is actually a recording of Jack's violin playing. Delighted, Jack hurries to a recording studio to cut a record, but his music destroys the equipment. After discovering the truth, Jack thanks Rochester for his efforts. For an encore, Stern and pianist Alexander Zakin perform "Polonaise Nº 1 in D Major" (thetvdb.com)