Pop Mašina crystallized Yugoslavia's most experimental rock impulse on Kiselina, an album that lives up to its acidic title. Released in 1973, this record careens between prog rock complexity, folk traditions, and heavy psychedelic intensity—"Na Drumu Za Haos" arrives with hypnotic riffs and martial drums, while "Kiselina" itself stretches into a full-band freak-out. The production is thick and enveloping, with woozy organ and sludgy guitars creating genuine atmosphere. "Pesma Srećne Noći" offers moments of weird beauty before the journey turns darker. Think early Black Sabbath crossed with Balkan folk traditions.