(3-CD set) German ambient space-rock pioneers Kluster were originally a trio featuring Conrad Schnitzler, Hans-Joachim Roedelius, and Dieter Moebius. During their brief life span they recorded three LPs, all available in this deluxe box set. Klopfzeichen and Zwei-Osterei recorded in 1969 and 1970 respectively, were the trios only two studio albums. The trio's third album, Eruption, was a live recording of the band's last concert in 1971. All three are amazing examples of pioneering ambient music featuring guitar, percussion, keys, and cello heavily processed with echo, filters, and tape machines to create a unique effect, unlike anything else at the time.