Mamma Mia! is a jukebox musical written by British playwright Catherine Johnson, based on songs recorded by Swedish group ABBA and composed by members Benny Andersson and Björn Ulvaeus. The musical's title is taken from the group's 1975 chart-topper "Mamma Mia". Ulvaeus and Andersson were involved in the development of the show from the beginning, while singer Anni-Frid Lyngstad was involved financially in the production and also appeared at many of the premieres around the world.