"Erhard Hirt (born October 31, 1951 in Bonn ) is a German jazz and improvisation musician ( guitar, electronics).

Hirt initially played self-taught blues before working with jazz-oriented rock bands from 1970. From 1974 he played in the experimental group "Jazz community," but in addition also with blues bands like the "Delta Blues Band" or "Matt Walsh blues band" before he founded his own improvisation ensemble in 1979, with whom he on the 1981 Moers Festival occurred. He then played with Wolfgang Fuchs, Hans Schneider and Paul Lytton in the group XPACT, which recorded the album "Frogman's View" in 1984, but also in a trio with Schneider and Radu Malfatti. In addition to Fuchs, Malfatti and Lytton, he was involved in founding the European "King Übü Orchestrü" in the mid-1980s. He appeared in a trio with Phil Minton and Willi Kellers, and in a duo with Lol Coxhill. In 1990 he formed a duo with Dietmar Diesner, in 1992 he was a member of the Humannoise Ensemble, along with Helmut Bieler-Wendt, Maud Sauer and Uwe Oberg. He continued to work with Anne LeBaron, Phil Wachsmann and Alfred Zimmerlin, with Minton and John Butcher (CD 1996) and with the multi-instrumentalist Martin Klapperand with the Swiss vocalist Dorothea Schürch. But since 1977 he has also performed solo projects, presented solo albums and toured the United States with them. He has also performed with other guitarists such as Derek Bailey, Hans Reichel, Joe Sachse, Uwe Kropinski, Eugene Chadbourne, Jean-Marc Montera and Stephan Wittwer. In the guitar quartet Extended Guitars he meets Keith Rowe, Hans Tammen and Nick Didkovsky. Since 1997 he has been part of the Ensemble Realtime, in which improvisers from North Rhine-Westphalia such as Mark Charig,Gunda Gottschalk, Ute Völker, Melvyn Poore, Stefan Keune and Thomas Lehn work together. He recorded the album "Trinidad" (1999) with Lehn and Martin Theurer.

In 1984 Hirt received the WDR's "Town Music Prize". According to the journal "Guitar Techniques", he is "one of the most original and fascinating experimental solo guitarists at the moment..." "

"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."