2023. Trikolon was a gifted trio from Osnabrück. As precursor of Tetragon, they played a very varied and strongly influenced progressive rock. They were influenced by classic rock and blues. Their only LP 'Clus..

1995. An ecology-inspired Krautrock album (1971) from a short-lived group comprised of German school-chums, some of whom had recorded an LP as Trikolon. Tetragon did not conform to any predetermined musical style: t..

2009. Tetragon, successor of Trikolon, were founded in Osnabruck (Lower Saxony) in the spring of 1971. They released their first and only LP, "Nature", in that very year. It came out as CD on Musea in 1995..

2011. Tetragon, successor of Trikolon, were founded in Osnabrueck (Lower Saxony) in the spring of 1971. They released their first and only LP, "Nature", in that very year. It came out as CD on Musea in 199..