ABBA was a Swedish Eurovision Song Contest-winning pop music group active between 1972 and 1982. The quartet was formed through the friendship of Benny Andersson and Bjrn Ulvaeus and also consists of Anni-Frid Lyngstad (usually known as Frida) and Agnetha Fltskog.They topped the charts worldwide from the mid-1970s to the early 1980s. The name -ABBA- is an acronym formed from the first letters of each of the group member-s given name (Agnetha; Bjrn; Benny; Anni-Frid). "SOS" was written by Benny Andersson, Bjrn Ulvaeus and Stig Anderson. The title itself was coined by Stig, though the lyrics he provided were re-written by Ulvaeus. "SOS" was among the first three songs recorded for the group's upcoming 1975 album, ABBA.
Despite the song's catchiness, it was passed over as the lead single from the album; the track "So Long" was chosen instead. "So Long" was chosen primarily because it had the same uptempo beat as their 1974 hit single, "Waterloo."
The descending chords and ominous synthesizer melody line of the introduction set the tone for Fltskogs vocals, sounding almost as if she were breaking down in tears.ABBA was a Swedish Eurovision Song.