As light and insubstantial a comedy as it is, A Cudahy Caroler Christmas is the gift that keeps on giving. In Tandem Theatre has staged Anthony Wood's classic South Side holiday comedy many, many times over the years, before taking a three-year hiatus. With over 170 performances in the role, Chris Flieller returns as Stasch Zielinski, an affable working-class guy who is trying to round up a group of carolers who have had a falling out. South Side Milwaukee mutations of traditional Christmas carols ensue. The group is reunited just in time for a big local TV broadcast and a good time is had. The production features a slightly different cast than in past years but the same old memorable songs, including "Ach Ya’ Der Once" and "O, Bowling Night.” It's nice to see this recent tradition return again. The production runs through Jan. 5 at the Tenth Street Theatre.