Mamma Mia! is billed as The World's No. 1 Show. Catherine Johnson took 20 ABBA songs and wrote a mother/daughter story around them. Her story is appropriate as women's issues are a major theme of songwriters Benny Andersson and Bjorn Ulvaeus. Detractors call Mamma Mia! a jukebox musical. If nothing else, it is a means of perpetuating the ABBA catalog, a body of 110 songs which surpasses The Beatles in quality. Indeed, ABBA was the Swedish Fab Four. Mamma Mia! stays on tour, and it has a permanent home in Las Vegas at Mandalay Bay. It is refreshing to see a musical whose every song is a recognizable hit. Dancing Queen, Take A Chance On Me and Waterloo transport us back to the 1970s, that halcyon interlude between Vietnam and the War on Terror. We will never relive that period, but Mamma Mia! offers an over-the-shoulder glimpse.