An album that heralded the beginning of a new era: Kraftwerk's fourth album, Autobahn, marks the Düsseldorf-based group's transition from a Krautrock group to an electronic band and is widely regarded as a milestone. With the more than 20-minute sequences of the title track alone, Kraftwerk influenced the development of modern electronic music. And this in 1974, when the reign of rock music was still unbroken.