[1] Hartberg attended Foss Upper Secondary School (1991–94), on the Music program together with the artists Bertine Zetlitz, Jannike Kruse, Kate Havnevik and the author Markus Midrè.
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.
Hartberg and Esben Selvig was in 2002 awarded Edvard Prize in the class Text to music, within the band Klovner i Kamp tune «Nattens sønner».
[1] Hartberg plays in the rock band «Yoga Fire» together with Jonas Forsang Moksnes, Esben Selvig, Sveinung Eide and Søren Brandt.
He has also contributed to albums by Paperboys, «Apollo», «URO» and Lars Beckstrøm among others, and has written the book Fuck you eller penga tilbake published on «Tiden forlag» 2009.