What a strange thing popular culture is. Back in the 1970s a lot of people might have affected to despise Abba but when it comes to this revival of Mamma Mia! The Musical at Melbourne’s legendary theatre the Princess they’re singing along and tapping their feet. This is a young zestful production of a show we know like the back of our hands but it’s remarkable how much it can be an active exhilaration and not just a bit of appliqué nostalgia.