Claus-Robert Kruse ,german composer,who studied classical piano,composing and music-theory at the High School of Music in Hamburg. In his early years he developed several minimalistic musical structures. One of them is "KAMMERTON",a "Meditation in 3 Movements". The compositions are focussed on the popular "kammerton", which means today 440 Hz. Together with the PI-Symphonic-Orchestra of Prag,CzechRepublic ,he realized all three movements in an extraordinary way of musically performance.