📖About

Björn Kristian Ulvaeus (credited as Björn Ulvæus [bjœːɳ ɵlˈveːɵs]; born 25 April 1945) is a Swedish songwriter, producer, a member of the Swedish musical group ABBA, and co-composer of the musicals Chess, Kristina från Duvemåla, and Mamma Mia!. He co-produced the film Mamma Mia! with fellow ABBA member and close friend Benny Andersson.