Knuckleheadz was a British hard house and hard trance duo that gained prominence in the late 1990s and early 2000s. Comprised of producers Jon Langford and Warren Clarke, the group became known for their energetic and driving tracks that captured the essence of the club scene during that era. They contributed to numerous compilations and released tracks on well-regarded labels like Tidy Trax. Their work, characterized by pounding beats and infectious melodies, helped shape the sound of UK hard house during its peak years.