Music-wise, the festival is actually very unconcerned about genres and hosts music that ranges from rock, punk and black metal to ska, grindcore and psychobilly. Still, the main expression is punk rock, played more or less by bands from Slovenia, who are sometimes joined by musicians from neighbouring countries and occasionally from elsewhere as well.
Some of the bands hosted at Kramp Fest include Muškat Hamburg, Joko Ono, Indust Bag, Alkohol, Dance Mamblita, Extreme Smoke 57, Đornata, Via Ofenziva, Zaprti oddelek, Clockwork Psycho, Alkohol, Vivere Merda (IT), Hijos del pueblo (HR), Bestial vomit (IT), AK 47 (HR), Nulla osta (HR), Concrete worms (RS), Punkart (BA), Satan (FR) and so on.