ABBA was a Swedish pop music group formed in Stockholm in 1972, consisting of Anni-Frid "Frida" Lyngstad (Anni-Frid Lyngstad), Bj�rn Ulvaeus, Benny Andersson and Agnetha F�ltskog. F�ltskog and Ulvaeus were a married couple, as were Lyngstad and Andersson during their career, although both couples later divorced. They became one of the most commercially successful acts (List of best-selling music artists) in the history of popular music, and they topped the charts worldwide from 1972 to 1982.

ABBA gained international popularity employing catchy song hooks (hook (music)), simple lyrics, sound effects (reverb, phasing) and a Wall of Sound achieved by overdubbing the female singers voices in multiple harmonies. As their popularity grew, they were sought after to tour Europe, Australia, and North America, drawing crowds of ardent fans, notably in Australia. Touring became a contentious issue, being particularly cumbersome for F�ltskog, but they continued to release studio albums to widespread commercial success. At the height of their popularity, however, both relationships began suffering strain that led ultimately to the collapse of first the Ulvaeus-F�ltskog marriage (in 1979) and then of the Andersson-Lyngstad marriage in 1981. In the late 1970s and early 1980s these relationship changes began manifesting in the groups music, as they produced more thoughtful, introspective lyrics with different compositions.

ABBA remains a fixture of radio play lists and is one of the worlds best-selling bands, having sold over 375 million records worldwide, making them the fourth best-selling popular music artists in the history of recorded music. They still sell two to three million records a year. ABBA was also the first pop group from mainland Europe (Continental Europe) to enjoy consistent success in the charts of English-speaking countries, including the United Kingdom (UK Singles Chart), the United States (Hot 100 Singles Sales), Canada, Ireland (Republic of Ireland), South Africa/Rhodesia, Australia (ARIA Charts) and New Zealand (RIANZ). Their popularity in Latin America was also undeniable, as well as reaching the top of the charts in different countries like Mexico, Argentina, Brazil, Colombia and Peru among others, the band also released a compilation of their hit songs translated into Spanish. "Gracias por la musica" was released in 1980 to be followed by "ABBA ORO" in 1999.

After ABBA split, Andersson and Ulvaeus achieved success writing music for the stage while Lyngstad and F�ltskog pursued individual solo careers with varying success. ABBAs music remained steadily popular until several films, notably Muriels Wedding and The Adventures of Priscilla, Queen of the Desert, revived interest in the group, spawning several tribute bands. In 1999, ABBAs music was adapted into the successful musical Mamma Mia! that toured worldwide and had a movie version (Mamma Mia! (film)) released in 2008, becoming the highest grossing film in the UK ever. The group was inducted into The Rock and Roll Hall of Fame on 15 March 2010. Only Benny Andersson and Anni-Frid Lyngstad were present to accept ABBAs induction into the Rock and Roll Hall of Fame. The group was inducted into the museum by Bee Gees members Barry Gibb and Robin Gibb.