ABBA for the group. The track would set the stage for ABBA's foray into disco with their next album. On 9 January 1979, the group performed "Chiquitita" at the Music for UNICEF Concert held at the United Nations General Assembly to celebrate UNICEF's Year of the Child. ABBA donated the copyright of this worldwide hit to the UNICEF; see Music for UNICEF Concert. The single was released the following week, and reached number-one in ten countries. In mid-January 1979, Ulvaeus and Fältskog announced they were getting divorced. The news caused interest from the media and led to speculation about the band's
SOS (ABBA song) rock chorus in a major key, dominated by a distorted electric guitar and full vocals. 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". Lyricist Ulvaeus has said that, after three years of trying to figure out what style would define them, ABBA found its identity as a pop group with the release of "SOS". The song was the subject of one of the first pioneering music videos produced