Autobahn is the fourth studio album by German electronic music band Kraftwerk, released in 1974. The album marked several personnel changes in the band, which was initially a duo consisting of Florian Schneider and Ralf Hütter; later, the group added Klaus Röder on guitar and flute, and Wolfgang Flür on percussion. The album also completed the group's transition from the experimental krautrock style of their earlier work to an electronic pop sound consisting mostly of synthesizers and drum machines.