Körberg represented Sweden in the 1969 and 1988 Eurovision Song Contests.

In 1969, he won a Swedish Recording Industry Award Grammis in the category Best Debut Performance.

He has also appeared in the Swedish productions of other musicals, usually in a starring role, including The Sound of Music and Les Misérables. 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 was nominated for a Laurence Olivier Award in the category Outstanding Performance by an Actor in a Musical, for his role in the 1986 world premiere of Chess.

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.

For the 2002 Swedish production of Chess, he won a Guldmasken, the national Swedish theater award, in the category Best Actor in a Musical.

Körberg was born in Norsjö. In July 2007 he married Anne-Charlotte Nilsson.

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 tried out for Eurovision in Melodifestivalen 2013 with the song “En Riktig Jävla Schlager” with the group Ravaillacz. They ended up in 10th place in the final.

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”.