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K4 is a bootleg of a Kraftwerk performance at Gondel-Kino, Bremen (June 25, 1971), recorded by German public broadcasting station "Radio Bremen". The concert dates from the short period of time in 1971—estimated to be about 6 months—during which Ralf Hütter had left the band. From the lineup, one can see that it is more a jam session of Neu! joined by Kraftwerk's Florian Schneider playing improvisations of Kraftwerk songs. Consequently, the sound is not at all typically for Kraftwerk; it is more like a mixture of both group's sound, especially considering the dominant guitar playing of Michael Rother. Very much, ing…

Although the recording has never been sold officially, it has been widely traded amongst fans under different and sometimes incorrect album titles, i.e. as "Ruckzuck" (vinyl), "Köln 12.06.1971" (vinyl picture disc), "Live in Köln 12.6.1971" (CD), "Bremen" (CD), "K4" (CD) or "Live on Radio Bremen" (CD). Some of these have only 3 tracks, while others include 5 tracks (with the two extra tracks possibly taken from the Radio Bremen Beat-Club appearance.)

Tracklisting (from "Live on Radio Bremen"):
1. Heavy Metal Kids 7:55
2. Stratovarius 15:34 (called "K1" on "K4")
3. Ruckzuck 19:21 (called "K2 (Ruckzuck)" on "K4")
4. Vom Himmel Hoch 15:24 (called "K3" on "K4")
5. Rueckstoss Gondliere 11:25 (misspelled on the back cover, correctly as "Rueckstoss Gondoliere" on the CD and in the booklet - called "K4" on "K4")

Florian Schneider (flute, electronics)
Michael Rother (guitar, electronics)
Klaus Dinger (drums)

For more information have a look at's bootleg page.

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