From 1965 to 1968, Körberg was a singer in the Swedish pop group
Tom & Mick & Maniacs, which went through several name changes. In August 1967, the group released the single "
Somebody's Taken Maria Away", a cover of an
Adam Faith song from 1965. The song went on to top the official
Tio i Topp record chart for six consecutive weeks. The group had two additional hits on the chart: "Please, Please, Please" reached number five in April 1967 and "I (Who Have Nothing)" peaked at number eight in February 1968. Following Tom & Mick & Maniacs' break-up in 1968, Körberg released his first solo album
Nature Boy. Körberg has represented Sweden in the
Eurovision Song Contest on two occasions. In
1969 he finished ninth with "Judy, min vän" and in
1988 he finished twelfth with "Stad i ljus". He has also appeared in the Swedish productions of other musicals, usually in a starring role, including
The Sound of Music and
Les Misérables (as
Jean Valjean). He was a supporting actor in the 1984 Swedish fantasy film ''
Ronia, the Robber's Daughter'', based on the novel by the same name by Swedish author
Astrid Lindgren. Körberg voiced the
Beast in the Swedish dub of
Beauty and the Beast, and also sang the Swedish version of the title song on the soundtrack. In the 1990s and 2000s, he took time off from other projects in order to recreate the role of Anatoly/"The Russian" in subsequent productions of
Chess, including the 1994 tenth anniversary concert and the 2002
Stockholm production. For years, he collaborated with Monica and Carl-Axel Dominique in the experimental group Solar Plexus. In his own performances, he has worked extensively with Stefan Nilsson, and including songs by
Jacques Brel. Körberg is also a frequent performer with
Benny Andersson's band,
Benny Anderssons Orkester (BAO), singing mostly dance music and music by Andersson. In 2008 he starred in the musical
Dirty Rotten Scoundrels at Cirkus in Stockholm, and in 2009 he played Professor Henry Higgins in
My Fair Lady in Stockholm acting opposite
Helen Sjöholm, who portrayed the role of Eliza Doolittle. In the autumn of 2010, Körberg and his long-time friend Claes Malmberg gave a show in
Gothenburg called
The Big Bang Show. He was one of three judges on the Swedish reality television singing competition
True Talent, which ran for one season in 2011. In 2013 he competed in
Melodifestivalen 2013, Sweden's selection for the
Eurovision Song Contest 2013, with the song "En Riktig Jävla Schlager" with the group Ravaillacz. They ended up in 10th place in the final. In 1995, he was invited as one of the seventeen Jean Valjeans from around the world to perform the encore of the Les Misérables 10th Anniversary Concert at the Royal Albert Hall in London. In 2017, he appeared as a guest performer on the album "Worlds Collide" by Swedish
metalcore band
Dead By April, singing on the last song, "For Every Step". In January and February 2025, he's set to return to
Les Misérables in the Arena Spectacular World Tour as
The Bishop of Digne opposite
Peter Jöback as Valjean. ==Awards and honors==