Karjalan Sissit is a martial industrial project that is known for its intense and emotionally charged music, blending orchestral samples with heavy percussion and raw, shouted vocals. The project was founded in the year 2000 by Markus Pesonen, who is of Finnish heritage but spent much of his life in Sweden, adding a unique cultural blend to his music. With a name that translates to "Karelian Guerrillas," the project's themes often revolve around personal struggles, existential angst, and a hard-edged critique of society, all conveyed with a dark, aggressive sound that borrows from both neoclassical and industrial influences.

The intensity and unapologetically blunt nature of Karjalan Sissit's work are evident in their album titles and the visceral energy of each release. Albums like "...Want You Dead" and "Fucking Whore Society" offer a glimpse into the dark and often confrontational tone that defines their audio aesthetic. Meanwhile, releases such as "Tanssit On Loppu Nyt" and "Karjalasta Kajahtaa" not only pay homage to Pesonen’s roots with Finnish titles but also showcase the project's ability to fuse traditional European sounds with modern industrial noise, creating an evocative soundscape that is both raw and melancholic. Their self-titled release "Karjalan Sissit" as well as "Miserere" helped to cement the project's reputation within the post-industrial music scene, carving out a niche for listeners who are drawn to the more aggressive, cathartic side of the genre.