The New Group, celebrating its 30th anniversary this spring, may not be so new anymore, but that doesn’t mean they have forgotten how to rock. Indeed, their latest production, a pop musical called The Last Bimbo of the Apocalypse, is nothing if not a Gen Z shout-out to teenage angst. With his music and lyrics, Michael Breslin delivers a handful of clever, hard-driving songs into the hands of a capable company of young performers. Unfortunately, Breslin’s book, co-written with Patrick Foley, has all the charm of an undisciplined child.