Having gained international recognition with ABBA, Bjorn Ulvaeus is a Swedish Music composer, predominantly working in Hollywood. He was a member of the Swedish folk-schlager band known as the West Bay Singers, having a huge following at the time. In 1966, he collaborated with the Hep Stars' keyboard player, Benny Andersson. He has co-composed for films like Summer of Sam (1999), Get Smart (2008), and Mamma Mia! (2008), which also marked his debut as a film producer. His other projects include The Hangover Part II (2011) and Mamma Mia! Here We Go Again (2018).