Björn Kristian Ulvaeus (Swedish pronunciation: [ˈbjœːɳ ɵlˈvěːɵs] (listen); born 25 April 1945) is a Swedish singer, songwriter, producer, a member of the musical group ABBA, and co-composer of the musicals Chess, Kristina från Duvemåla, and Mamma Mia! He co-produced the films Mamma Mia! and Mamma Mia! Here We Go Again with fellow ABBA member and close friend Benny Andersson. He is the oldest member of the group.
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