|Studio album by Kluster|
|Producer||Oskar Gottlieb Blarr|
Klopfzeichen is the first full-length album by German experimental music trio Kluster.
Klopfzeichen was recorded on December 21, 1969 at Rhenus-Studio, Gordorf, Germany. Liner notes on the CD reissue on the Hypnotic label as well as some websites place the recording date precisely one year later in 1970. This is incorrect as it would place the recording after the initial release date. In addition Kluster founder Conrad Schnitzler states in interviews that the recordings took place during the same period as the first Tangerine Dream album, Electronic Meditation, which occurred in late 1969.
The album was first reissued by Schwann in 1980 – with new cover art and a sticker touting Cluster and Conrad Schnitzler's previous membership in Tangerine Dream – and then on the U.S. based Hypnotic label in 1996. This CD reissue also contains a nearly 16 minute long bonus track from the 1980 Cluster & Farnbauer release Live In Vienna.
The album was again reissued on the Japanese Captain Trip label on April 20, 2007 as a 450 copy limited CD edition with an adaption of the original cover art-work and a bonus track by Eruption, Black Spring, from their 1971 sessions.
- "Kluster 1" - 24:00
- "Kluster 2" - 21:51
- Conrad Schnitzler
- Hans-Joachim Roedelius
- Dieter Moebius
- Christa Runge - Voice, Track 1
- Conrad Plank - Engineer
- J. Liebig - Engineer
- Oskar Gottlieb Blarr - Producer
- Allmusic link
- Schnitzler, Conrad  Retrieved August 17, 2007.
- The Edge  Retrieved August 17, 2007.
- Ankeny, Jason. "Klopfzeichen". Allmusic. Retrieved August 18, 2013.
- Scaruffi, Piero (1999). "Cluster". pieroscaruffi.com. Retrieved August 18, 2013.