SOS
Written by Björn Ulvaeus, Benny Andersson, and Stig Anderson for ABBA's eponymous third album, this song featuring Agnetha Fältskog on lead vocals became the group's first major worldwide hit since "Waterloo." Released on June 3, 1975, it reached the top spot in Australia, Belgium, New Zealand, South Africa, and West Germany, and peaked at number six on the UK singles chart.