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Björn Kristian Ulvaeus (born 25 April 1945) is a Swedish songwriter, composer, musician, writer, producer, a former member of the Swedish musical groups Hootenanny Singers and ABBA, and co-composer of the musicals Chess, Kristina från Duvemåla, and Mamma Mia! He coproduced the film Mamma Mia! with fellow ex-ABBA member and close friend Benny Andersson.