A show this silly is critic-proof. Lyricist Tim Rice and composer Andrew Lloyd Webber have their way with various musical genres and egregious anachronisms, representing Pharaoh as Elvis and Joseph's brothers rejoicing over his "death" as a hoedown. Originally created in 1968 as a 15-minute cantata for schoolkids and expanded over the years, the show harks back to its roots with the inclusion of a local children's choir. But in other respects it's simply showing its age. If you consider disco timeless, however, and like loud noises and flashing lights (or your kids do), this is the perfect outing. Patrick Cassidy brings Nordic good looks to the role of Joseph, but his belting can be flat. Through 12/4: Thu 7:30 PM, Fri 8 PM, Sat 2 and 8 PM, Sun 2 and 7:30 PM, Auditorium Theatre, 50 E. Congress, 312-902-1400, $25-$72. Closing.