This is the japanese version of Kraftwerk - Concert Classics. Various versions seem to exist. With transparent and with black jewelcases. On the back and front of the case a blue sticker is attached. Therefore transparent jewelcase have another cover with the Autobahn logo in blue on black. When the CD was released in 1998 a Japanese press release is said to state that the concert was recorded in Dallas Broncos Bowl on 1/5/1975. However latest investigations to a series of recordings from Denver clearly indicate this recording coming from a 20/05/1975 gig in Denver.
Although Kraftwerk's first three albums were groundbreaking in their own right, Autobahn is where the group's hypnotic electronic pulse genuinely came into its own. The main difference between Autobahn and its predecessors is how it develops an insistent, propulsive pulse that makes the repeated rhythms and riffs of the shimmering electronic keyboards and trance-like guitars all the more hypnotizing. The 22-minute title track, in a severely edited form, became an international hit single and remains the peak of the band's achievements – it encapsulates the band and why they are important within one track – but the rest of the album provides soundscapes equally as intriguing. Within Autobahn, the roots of electro-funk, ambient, and synth pop are all evident – it's a pioneering album, even if its electronic trances might not capture the attention of all listeners.
Although Autobahn was a left-field masterpiece, Trans-Europe Express is often cited as perhaps the archetypal (and most accessible) Kraftwerk album. Melodic themes are repeated often and occasionally interwoven over deliberate, chugging beats, sometimes with manipulated vocals; the effect is mechanical yet hypnotic.
Continuing to work with Conny Plank, who once again provides a compelling job as producer and engineer, Kraftwerk went right ahead and named their new album after their two remaining members – an understandable enough move. Like the first two albums, Ralf and Florian still has not seen official re-release, for all that one can practically taste Kraftwerk's leap into the beyond on it. Given that this was the last album before the most famous lineup was formed and Autobahn was released, it's appropriate to listen to Ralf and Florian as a harbinger for the future, though perhaps all too easy. Take it on its own terms – a further investigation of electronic possibilities in a more open-ended, less constantly structured fashion than would be the case later – and Ralf and Florian becomes most enjoyable.
A concept album exploring themes of broadcast communications, Radio-Activity marked Kraftwerk's return to more obtuse territory, extensively utilizing static, oscillators, and even Cage-like moments of silence to approximate the sense of radio transmission; a pivotal record in the group's continuing development, the title track – the first they ever recorded in English – is their most fully realized electro-pop effort to date, while "The Voice of Energy" precipitates the robot voice so crucial to their subsequent work.
The last great Kraftwerk album, Computer World (Computerwelt) captured the band right at the moment when its pioneering approach fully broke through in popular music, thanks to the rise of synth pop, hip-hop, and electro. As Arthur Baker sampled "Trans-Europe Express" for "Planet Rock" and disciples like Depeche Mode, OMD, and Gary Numan scored major hits, Computer World demonstrated that the old masters still had some last tricks up their collective sleeves. Compared to earlier albums, it fell readily in line with The Man-Machine, eschewing side-long efforts but with even more of an emphasis on shorter tracks mixed with longer but not epic compositions.
The Man-Machine is closer to the sound and style that would define early new wave electro-pop – less minimalistic in its arrangements and more complex and danceable in its underlying rhythms. Like its predecessor, Trans-Europe Express, there is the feel of a divided concept album, with some songs devoted to science fiction-esque links between humans and technology, often with electronically processed vocals ("The Robots," "Spacelab," and the title track); others take the glamour of urbanization as their subject ("Neon Lights" and "Metropolis"). Plus, there's "The Model," a character sketch that falls under the latter category but takes a more cynical view of the title character's glamorous lifestyle. More pop-oriented than any of their previous work, the sound of The Man-Machine – in particular among Kraftwerk's oeuvre – had a tremendous impact on the cold, robotic synth pop of artists like Gary Numan, as well as Britain's later new romantic movement.