US thrash icons Testament will storm the stages at the anniversary edition of Party.San Metal Open Air 2026, firing up the crowd with brutal riffs, razor-sharp grooves, and iconic anthems from over four decades. With an uncompromising live attack, they will catapult you back to the era of thrash metal. If you want to experience the legacy, Testament offers exactly that: unwavering energy, metallic purity, and songs that have long since become classics. Prepare yourselves – when this headliner takes the stage, no stone will be left unturned.
 

American death metal veterans Jungle Rot will take the stage at next year's anniversary celebration with their relentless groove, razor-sharp riffs, and crushing destruction. Their unmistakable sound – simple, brutal, and direct – will tear down the infield and take you right back to the origins of US death metal. With catchy anthems whose titles already reek of decay, Jungle Rot leave no survivors.

P.S:O:A premiere! 

Danish formation Sunken takes the stage at Party.San Open Air 2026 with a soundscape of dawning hope and dark depths. Their blend of atmospheric black metal, pulsating grooves, and melodic despair pulls you into an abyss from which no glimmer of light dares to rise. When the dark riff mesh permeates the camp, silent pain becomes cathartic power. Prepare yourselves — Sunken will lead you through the twilight beyond convention.