Kraftwerk 2 was entirely written and performed by founding Kraftwerk members Ralf Hütter and Florian Schneider in late 1971, with the sessions produced by the influential Konrad "Conny" Plank. Hütter later said of the album's recording: Perhaps the least characteristic album of their output, it features no synthesizers, the instrumentation being largely electric guitar, bass guitar, flute and violin. The electronics on display generally belong to the realm of 1960s tape-based music more usually produced in academia, with heavy use of tape echo, and reverse and altered speed tape effects. Overall, the sound has a rather muted, twilit, dusky feel, similar in feel to "Megaherz" on Kraftwerk's debut album, as Hütter and Schneider explored the possibilities for electronic and auto-mechanical enhancement of their music. The lengthy, almost side-long "Klingklang" which opens the album is notable for its use of a preset organ beatbox to provide the percussion track. It starts with a clangourous Stockhausen-like metallic percussion montage and gives rise to the unmistakable Kraftwerk sound. Later, the song title also became the name of the band's own self-built studio, in Düsseldorf. "Atem" is a recording of breathing, while "Harmonika" features a tape-manipulated mouth organ. The cover design, credited to Ralf and Florian, further hints at a deliberate association with conceptual art, being a repeat of the first album's pop art design – except this time fluorescent green replaces the red and the number '2' is added. It was eventually released in the UK, combined with the first Kraftwerk album as a double LP package, by the Vertigo label in March 1973, more than a year after its German release in January 1972. No material from this album has been performed in the band's live set since the Autobahn tour of 1975, and to date, the album has not been officially reissued on compact disc. The band is seemingly reluctant to consider the album as a part of its canon; in later interviews, Schneider described the first three Kraftwerk albums as "archaeology". However, unlicensed CDs of the album have been widely available since the mid-1990s on the Germanofon and Crown labels. Kraftwerk has hinted that the album may finally see a re-mastered CD release after its Der Katalog boxed set.
