Two and a half decades after its sun-soaked pop fantasy arrived in England, Mamma Mia! lives on in an eternal end of history — specifically, the 1990s. The boomers get older, the world grows unstable (remember, this show premiered on Broadway in October 2001 ). But Mamma Mia! does not change. When you head into the Winter Garden Theatre this summer, Donna Sheridan, the expat hotel manager whose daughter has decided to invite her three possible fathers to her wedding, is still blithely refusing to learn what the internet is. She is still someone who was cavorting around in the 1970s with her girl group. There are still perky young men in wetsuits to flirt with and brooding old flames who followed those rising late-20th-century market tides from the counterculture into banking, archite

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