ABBA Knowing Me Knowing You.

"On April 25, 1945, born on this day, Bjorn Ulvaeus, Swedish singer, songwriter, producer who started his musical career at 18 when he fronted the Hootenanny Singers, a popular Swedish folk–skiffle group. After forming ABBA in 1972 they became one of the best-selling music artists of all time. Their first UK hit was the 1974 No.1 single 'Waterloo', followed by eight other UK No.1 singles and nine No.1 albums. He is the co-composer of the musicals Chess and Mamma Mia! (and co-produced the film) with fellow ABBA member and close friend Benny Andersson."