Björn Ulvaeus

Björn Kristian Ulvaeus (; born 25 April 1945) is a Swedish musician, singer, songwriter, and producer best known as a member of the musical group ABBA. He is also the 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. Provided by Wikipedia