A rarefied, more specific reorientation of ambient house, Ambient Techno is usually applied to artists such as B12, early Aphex Twin, the Black Dog, Higher Intelligence Agency, and Biosphere. It distinguished artists who combined the melodic and rhythmic approaches of techno and electro -- use of 808 and 909 drum machines; well-produced, thin-sounding electronics; minor-key melodies and alien-sounding samples and sounds -- with the soaring, layered, aquatic atmospheres of beatless and experimental ambient. Most often associated with labels such as Apollo, GPR, Warp, and Beyond, the terminology morphed into "intelligent techno" after Warp released its Artificial Intelligence series (although the music's stylistic references remained largely unchanged).