ABBA Members' Musical Premieres

"Mamma Mia!" -- a musical written by ABBA's Benny Andersson and

Björn Ulvaeus and based on songs by the Swedish pop group --

premiered at London's Prince Edward Theatre Tuesday night (April 6). The play,

which centers around a single mom and her daughter, features 27 songs performed

by a 28-member cast. " 'Mamma Mia!' is the musical we never knew we had

written," guitarist-vocalist Ulvaeus wrote in a posting on the musical's

official website. "I thought that if we had a proper story, where the songs

appeared as though they had been written for it, then it would work; and this is

what we have done."