"Los Cuatro Jinetes del Apocalipsis" by Zarpa is definitely the rarest Spanish hard rock / metal album ever released. It appears on top of want lists of heavy metal collectors worldwide and original copies are impossible to find (tough collectors in Spain even doubt its existence!) being even rarer than the first album by Spanish progsters Atila! It was recorded by four young long-haired musicians from Mislata, Valencia, in a budget studio and in only one take and released in 1978 on a tiny private label. Its a conceptual album featuring five long tracks with raw in-your-face sound and production, over-charged fuzz & wah wah guitar, powerful vocals and studio effects, in a similar vein to other Spanish underground hard rock bands from the 70s like Tapiman. This is must for any hard rock / metal / heavy psych afficionado, reissued for the first time and remastered from original master tapes, including a booklet with liner notes by Spanish heavy metal expert Jos Luis Granado and rare pictures from the archive of Vicente Feijo , the original guitarist & vocalist from Zarpa.