Musical 'Mamma Mia!' celebrates 25 years in London's West End

Back in 1999, the all female team behind musical "Mamma Mia!", based on songs by Swedish pop group ABBA, had no idea how successful their 'kitchen sink' show would be."The ABBA songs are the icing on the cake, but what we've done is we put the ABBA songs into context," Craymer said of the show, written by Catherine Johnson and directed by Phyllida Lloyd.