Effective period / Period of releases: 1976

Members: Jan Sivertsen, Jens Haack, Michael Bruun, Henrik Bødtcher, Jørgen Kaufmann, Max Leth Junior

Danish jazz-rock fusion group formed in 1975. Started out as a side project for Tyggegummibanden band members Michael Bruun, Henrik Bødtcher and Jan Sivertsen. Keyboard player and vipbraphonist Max Leth Junior - son of Max Leth - was the leading creative figure on the first album Heavy Joker in 1976, however he was replaced by Jørgen Kaufmann on the second album Caesar's Palace in 1978, while Michael Bruun was replaced by saxophone player Jens Haack.

Heavy Joker disbanded in 1978. Bruun & Siversten then joined Tøsedrengene with Aage Hagen & Klaus Kjellerup, who came from another jazz-rock fusion group, Pakhus 1.