"Klaus Kürvers, born 1950 in Essen (Germany), doublebass studies 1964-68 among others with Peter Trunk. During the late sixties member of the Essen Jazz groups ("Free Jazz" since 1967); 1969-71 in Cologne with the Jazz-Rock-Group "Eiliff" (w / Rainer Brüninghaus). Interupted 1971-2006 his public music activities for his studies and professional scientific career as an architect and cultural historian in Berlin. Since 2006 resumption of his musical activities as part of the Berlin improvisers' scene. Performing bassist again since 2009."

"Dietrich Petzold (born January 8, 1954 in Eisenach0 is a German violinist, composer and audio book director.

Petzold grew up as a son of the church musician and composer Johannes Petzold in Eisenach and Weimar, where he completed a classical violin training from 1959 to 1970. Since 1975 he has been freelance as a violinist and violinist in various occupations, LP and CD productions, film and TV (including: Klaus Lenz -Big-Band, Uschi Brüning & Co., Stefan Diestelmann Folk Blues Band, Toto Blanke, Manialdi - Quartett, Zülfü Livaneli, Maria Farantouri, Mikis Theodorakis, Chris Jarrett, Zotos Kompania, Michael Griener, Wu Wei, Johannes Bauer, Butch Morris.

Since 1980, Dietrich Petzold has been composing for theater, film and television (including DEFA, Deutsches Theater Berlin, Landestheater Schwerin, Landestheater Greifswald / Stralsund, Kleist Theater Frankfurt, Hackesches Hoftheater, Neues Theaterhalle, Junges Theater Zürich, Staatstheater Cottbus, Hochschule For film and television "Konrad Wolf", Teatret Vart, Molde / Norway).

Since the founding of his "office for applied music " tonus arcus also developed music for radio plays and radio features (among others for DS culture, SWF, MDR, ORB, SFB, NDR, DR, ORF, Hörbuch-Verlag, RBB0, Jazz and chamber music productions (among others for Germany radio, Germany Radio Culture, RAI III, Radioropa, ZDF, Radio Toscana Classica). Dietrich Petzold lives in Berlin. He is chairman of the Kulturinitiative Förderband e. V. and has a daughter."