Techno had its roots in the electronic house music made in Detroit in the mid-'80s. Where house still had explicit connection to disco even when it was entirely mechanical, techno was strictly electronic music, designed for a small, specific audience. The first techno producers and DJs -- Kevin Saunderson, Juan Atkins, and Derrick May, among others -- emphasized the electronic, synthesized beats of electro-funk artists like Afrika Bambaataa and synth-rock units like Kraftwerk. In the United States, techno was strictly an underground phenomenon, but in England, it broke into the mainstream in the late '80s. In the early '90s, techno began to fragment into a number of subgenres, including hardcore, ambient, and jungle.