ABBA: The Tour become more "present" to North American audiences. He further felt that the media would not consider ABBA to be a "real" group if they had not toured. In January 1979, ABBA performed alongside the Bee Gees, John Denver and Earth, Wind & Fire at the "A Gift of Song—Music for UNICEF Concert" at the United Nations General Assembly in New York City. The concert benefited the United Nations Children's Fund. Shortly after, it was revealed that members Björn Ulvaeus and Agnetha Fältskog had been separated for several months. Despite this, Agnetha assured the media that the group was united, stating,
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