 Besides «Klovner i Kamp» and «Oslo Fluid», they released records with «Salvador», «Malay Sparks» and «Mojo and He-man».In this period Hartberg also had success as a jazz musician.At 20y he replaced bassist Bjørn Kjellemyr in Halle/Eberson Quartet and at the end of the 1990s he started the band Shining together with Jørgen Munkeby, Morten Qvenild and Torstein Lofthus, fellow students at Norges Musikkhøgskole.