Tetragon was a short‑lived German rock formation that emerged after Ralph Schmieding left the trio Trikolon. The remaining musicians — Hendrik Schapper on organ and trumpet, and bassist Rolf Rettberg — continued with a new direction by bringing in guitarist Jürgen Jaehner and drummer Achim Luhrmann. Rather than keeping the old band name, the expanded lineup chose to start under a new identity. The group set up a simple recording space in a converted farmhouse, where they captured the material for what would become their only album, Nature, released in 1971. The sessions were recorded live due to the limited studio setup, giving the album its raw and direct character. Although the band dissolved shortly after the release, the album’s reputation grew steadily over the years, leading to multiple reissues and a lasting interest among collectors of early German progressive rock.
See for more.
Dragon Song
Snowstorm
Doors In Between
For Example
Hurry On Down
Agape (1973)
Nature
Fugue
The Light
Hovering Stones