Natur all is the first studio album released by Serbian hard rock band Cactus Jack. "Model donjeg ve a" is a Serbian language cover of U2 song "Hold Me, Thrill Me, Kiss Me, Kill Me". Album also features a cover of Led Zeppelin song "Kashmir". Hard rock (or heavy rock) is a loosely defined genre of rock music which has its earliest roots in mid-1960s garage rock, blues rock and psychedelic rock. It is typified by a heavy use of distorted electric guitars, bass guitar, drums, and often accompanied with pianos, and keyboards.