Tetragon from Osnabruck in Lower Saxony played organ-driven instumental jazz-rock and were thus somewhat reminiscent of Colosseum. Their first LP, "Nature", was released in 1971 and is today scarcely affordable. Their second album, "Stretch", was recorded in the optimally equipped Hamburg Windrose Studios at the end of 1971. At that time, however, its release failed so that a CD edition appeared only in 2009 and an LP in 2011. Some other immaculate and as yet unreleased studio recordings from the end of 1973, originally just intended for broadcasting purposes, have now been released as CD "Agape". Three of the six tracks were written by keyboarder Hendrik Schaper, one by all band members together, one by Eddie Harris, and the last one by Keith Emerson and Lee Jackson from The Nice. A spotless CD, made by undisputable musical talents and drawn from the master tapes.