Mamma Mia! is a stage musical written by British playwright Catherine Johnson, based on the songs of ABBA, composed by Benny Andersson and Bjorn Ulvaeus, former members of the band. The title of the musical is taken from the group's 1975 chart-topper 'Mamma Mia'. Bjorn Ulvaeus and Benny Andersson, who composed the original music for ABBA, were involved in the development of the show from the beginning.
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