In October 1984, Ulvaeus and Andersson together with lyricist Tim Rice released the musical concept double-album Chess.
The singles "One Night in Bangkok" (with vocals by Murray Head and Anders Glenmark ) and "I Know Him So Well" (a duet by Barbara Dickson and Elaine Paige, and later also recorded by Barbra Streisand and Whitney Houston) were both hugely successful.
The former reached number-one in Australia, Germany, Spain and Switzerland; number-two in Austria, France and New Zealand, and number-three in Canada, Norway, Sweden and the US.
In May 1986, the musical premiered in London's West End, and ran for almost three years.
Chess also opened on Broadway in April 1988, but closed within two months due to bad reviews.
In Stockholm, the composers staged Chess på svenska (Chess in Swedish) in 2003, with some new material, including the musical numbers "Han är en man, han är ett barn" ("He's a Man, He's a Child") and "Glöm mig om du kan" ("Forget Me If You Can").
In 2008, the musical was again revived for a successful staging at London's Royal Albert Hall which was subsequently released on DVD, and then in two successful separate touring productions in the United States and United Kingdom, in 2010.

Andersson and Ulvaeus' next project, Kristina från Duvemåla, an epic Swedish musical, premiered in Malmö, in southern Sweden in October 1995.
The musical ran for five years in Stockholm, and an English version has been in development for some considerable time.
It has been reported that a Broadway production is in its earliest stages of pre-production.
In the meantime, following some earlier workshops, a full presentation of the English translation of the musical in concert, now with the shortened name of "Kristina", took place to capacity crowds in September 2009 at New York's Carnegie Hall, and in April 2010 at London's Royal Albert Hall, followed by a CD release of the New York recordings.

Since 1983, besides Chess and Kristina från Duvemåla, Andersson has continued writing songs with Ulvaeus.
The pair produced two English-language pop albums with Swedish duo Gemini in 1985 and 1987.
In 1987, Andersson also released his first solo album on his own label, Mono Music, called "Klinga mina klockor" ("Ring My Bells"), containing material inspired by Swedish folk music – and followed it with a second album titled November 1989.

During the 1990s, Andersson wrote music for the popular Swedish cabaret quartet Ainbusk Singers, giving them two hits: "Lassie" and "Älska mig" ("Love me"), and later produced Shapes, an English-language album by Josefin Nilsson with all-new material by Andersson and Ulvaeus.
Andersson has also regularly written music for films (most notably to Roy Andersson's Songs from the Second Floor).
In 2001, Andersson formed his own band, Benny Anderssons Orkester (BAO), which released three successful albums in 2001, 2004 and 2007.
Andersson has the distinction of remaining the longest in the Swedish Radio Svensktoppen charts; the song "Du är min man" ("You Are My Man"), sung by Helen Sjöholm, spent 278 weeks there between 2004 and 2009.
Andersson released his third album BAO 3 in October 2007, of new material with his band BAO and vocalists Helen Sjöholm and Tommy Körberg, as well as playing to full houses at two of Sweden's largest concert venues in October and November 2007, with an audience of 14,000.

 Ulvaeus has not appeared on stage performing music since ABBA, but had a reunion with his co-members of the Hootenanny Singers on 16 July 2005 at a music festival in his hometown of Västervik, singing their 1966 hit "Marianne".

Andersson and Ulvaeus have been highly involved in the worldwide productions of the musical Mamma Mia!,
alongside Lyngstad who attends premieres.
They were also involved in the production of the successful film version of the musical, which opened in July 2008.
Andersson produced the soundtrack utilising many of the musicians ABBA used on their albums and tours.
Andersson made a cameo appearance in the movie as a "fisherman" piano player in the "Dancing Queen" scene, while Ulvaeus is seen a
In October 1984, Ulvaeus and Andersson together with lyricist Tim Rice released the musical concept double-album Chess. The singles "One Night in Bangkok" (with vocals by Murray Head and Anders Glenmark ) and "I Know Him So Well" (a duet by Barbara Dickson and Elaine Paige, and later also recorded by Barbra Streisand and Whitney Houston) were both hugely successful. The former reached number-one in Australia, Germany, Spain and Switzerland; number-two in Austria, France and New Zealand, and number-three in Canada, Norway, Sweden and the US. In May 1986, the musical premiered in London's West End, and ran for almost three years. Chess also opened on Broadway in April 1988, but closed within two months due to bad reviews. In Stockholm, the composers staged Chess på svenska (Chess in Swedish) in 2003, with some new material, including the musical numbers "Han är en man, han är ett barn" ("He's a Man, He's a Child") and "Glöm mig om du kan" ("Forget Me If You Can"). In 2008, the musical was again revived for a successful staging at London's Royal Albert Hall which was subsequently released on DVD, and then in two successful separate touring productions in the United States and United Kingdom, in 2010.
Andersson and Ulvaeus' next project, Kristina från Duvemåla, an epic Swedish musical, premiered in Malmö, in southern Sweden in October 1995. The musical ran for five years in Stockholm, and an English version has been in development for some considerable time. It has been reported that a Broadway production is in its earliest stages of pre-production. In the meantime, following some earlier workshops, a full presentation of the English translation of the musical in concert, now with the shortened name of "Kristina", took place to capacity crowds in September 2009 at New York's Carnegie Hall, and in April 2010 at London's Royal Albert Hall, followed by a CD release of the New York recordings.
Since 1983, besides Chess and Kristina från Duvemåla, Andersson has continued writing songs with Ulvaeus. The pair produced two English-language pop albums with Swedish duo Gemini in 1985 and 1987. In 1987, Andersson also released his first solo album on his own label, Mono Music, called "Klinga mina klockor" ("Ring My Bells"), containing material inspired by Swedish folk music – and followed it with a second album titled November 1989.
During the 1990s, Andersson wrote music for the popular Swedish cabaret quartet Ainbusk Singers, giving them two hits: "Lassie" and "Älska mig" ("Love me"), and later produced Shapes, an English-language album by Josefin Nilsson with all-new material by Andersson and Ulvaeus. Andersson has also regularly written music for films (most notably to Roy Andersson's Songs from the Second Floor). In 2001, Andersson formed his own band, Benny Anderssons Orkester (BAO), which released three successful albums in 2001, 2004 and 2007. Andersson has the distinction of remaining the longest in the Swedish Radio Svensktoppen charts; the song "Du är min man" ("You Are My Man"), sung by Helen Sjöholm, spent 278 weeks there between 2004 and 2009. Andersson released his third album BAO 3 in October 2007, of new material with his band BAO and vocalists Helen Sjöholm and Tommy Körberg, as well as playing to full houses at two of Sweden's largest concert venues in October and November 2007, with an audience of 14,000.
 Ulvaeus has not appeared on stage performing music since ABBA, but had a reunion with his co-members of the Hootenanny Singers on 16 July 2005 at a music festival in his hometown of Västervik, singing their 1966 hit "Marianne".
Andersson and Ulvaeus have been highly involved in the worldwide productions of the musical Mamma Mia!, alongside Lyngstad who attends premieres. They were also involved in the production of the successful film version of the musical, which opened in July 2008. Andersson produced the soundtrack utilising many of the musicians ABBA used on their albums and tours. Andersson made a cameo appearance in the movie as a "fisherman" piano player in the "Dancing Queen" scene, while Ulvaeus is seen a
ABBA