Kraut Rock refers to the legions of German bands of the early '70s that expanded the sonic possibilities of art and progressive rock. Instead of following in the direction of their British and American counterparts, who were moving toward jazz and classical-based compositions and concept albums, the German bands became more mechanical and electronic. Working with early synthesizers and splicing together seemingly unconnected reels of tape, bands like Faust, Can, and Neu created a droning, pulsating sound that owed more to the avant garde than to rock & roll. Although the bands didn't make much of an impact while they were active in the '70s, their music anticipated much post-punk of the early '80s, particularly industrial rock. Kraut rock also came into vogue in the '90s, when groups like Stereolab and Tortoise began incorporating the hypnotic rhythms and electronic experiments of the German art-rock bands into their own, vaguely avant-garde indie rock.