Bjorn Ulvaeus

Bjorn Ulvaeus, born on April 25, 1945, is a Swedish rock vocalist and guitarist best known as a member of the internationally acclaimed pop group ABBA. He contributed to the band's distinctive sound and was involved in many of their most famous songs, including "Waterloo" and "Dancing Queen."

Ulvaeus played a key role in ABBA's success during the 1970s and early 1980s, both as a performer and as a songwriter. His work with the group helped define the pop and rock music landscape of the era. In addition to his musical talents, Ulvaeus is recognized for his collaborations with other members of ABBA, particularly in songwriting and production.