Bjorn Ulvaeus, born April 25, 1945, is probably best known for the Swedish 70's super-group ABBA. He began his music career with the Hootenanny Singers. Later he met Benny Anderson and soon the two formed ABBA. The band lasted about 10 years but made history in such a short time with hits like Dancing Queen, Waterloo and Take a Chance on Me.
After ABBA, Bjorn has continued to collaborate with best friend Benny, writing musicals such as Chess and producing the movie Mamma Mia!