Benny Andersson (b. December 16, 1946, Sweden) and
Bjorn Ulvaeus (b. April 25, 1945, Sweden) were both members of a late-'60s Swedish pop group called
the Hep Stars. Leaving that group, they formed a duo,
Benny and Bjorn, and released one album, Lycka, in 1970. They then teamed with
Agnetha Faltskog and
Anni-Frid Lyngstad to form
ABBA, which became one of the most successful
pop groups of the 1970s. After
ABBA broke up in 1982,
Andersson and
Ulvaeus collaborated with British lyricist
Tim Rice to write the concept album/stage musical Chess. ~ William Ruhlmann, All Music Guide