In 1967 he opened the platform centrum freier cunst in Frankfurt/Main — a meeting point for live free music, art exhibitions, experimental poetry, action, and happening events.He invited Christoph Anders, Goebbels, Paul Lovens, composer Rolf Riehm, and Annemarie Roelofs for this project-LP, Es herrscht Uhu im Land using words by Kurt Schwitters a.o..In 1984 the Duo Goebbels/Harth created a musical theatre piece, Nach Aschenfeld together with the author and director FK Waechter and actors Heinz Werner Kraehkamp [de] and Michael Altmann.This was mounted at the Residenztheater in Munich where they played live within the stage scenery on a huge number of instruments, some partially self made, a kind of role model for Heiner Goebbels's Musik Theater in his later years.[3] During the transition phase of the opening of the East Harth was a member of Lindsay Cooper's group Oh Moscow (1987 to 1993, words by singer and film director Sally Potter), he had founded a postmodern group Vladimir Estragon (1988/89, comprising Einstürzende Neubauten drummer FM Einheit) referring in its titles to Samuel Beckett and James Joyce, a Trio Trabant a Roma (1990/1, Lindsay Cooper, Phil Minton, himself), a duo Parcours Bleu a Deux with Heinz Sauer (1990 to 1992), and a QuasarQuartet (1992/3, Simon Nabatov, Vitold Rek/Mark Dresser, Vladimir Tarasov, himself).In 1995 Harth created a first dedication to Korea in a Deutsches Jazz Festival Frankfurt event Han Guk – Land des unerfüllten Wunsches together with Dougie Bowne, Fred Hopkins, David Murray and himself.He composed for Korean ballet and on a recent solo disc micro saxo-phone, edition III (2011, released in the US on KSE), he had been experimenting with rudimentary "doublespeak" texts besides using contact microphones to "electrify" his saxophones by the means of electric devices as the Kaoss Pad a.o.– A23H/Sven-Åke Johansson/Nicole van den Plas : Duo Goebbels/Harth:[10] Sogenanntes Linksradikales Blasorchester ("So-called left-radical brass band"): Cassiber – A23H/Christoph Anders/Chris Cutler/Heiner Goebbels : Duck and Cover – A23H/Tom Cora/Chris Cutler/Fred Frith/Heiner Goebbels/Dagmar Krause/George E. Lewis : Gestalt et Jive – A23H/Steve Beresford/Anton Fier/Peter Hollinger/Ferdinand Richard/Uwe Schmitt : Duo Alfred 23 Harth/John Zorn : Duo Brötzmann/23 Harth : Lindsay Cooper's OH MOSCOW – A23H/Lindsay Cooper/Hugh Hopper/Marilyn Mazur/ Phil Minton/Elvira Plenar/Sally Potter : Vladimir Estragon – A23H/FM Einheit/Ulrike Haage/Phil Minton : Domestic Stories – A23H/Chris Cutler/Fred Frith/Lutz Glandien/Dagmar Krause : QuasarQuartet – A23H/Simon Nabatov/Vladimir Tarasov/Vitold Rek) Trio Trabant a Roma – A23H/Lindsay Cooper/Phil Minton : Imperial Hoot – A23H/Guenter Bozem/Marcel Daemgen/Christoph Korn : Trio Viriditas – A23H/Wilber Morris/Kevin Norton) Otomo Yoshihide [12] New Jazz Orchestra (ONJO) – A23H/Otomo Yoshihide/ Sachiko M/Axel Dörner/Mats Gustafsson/Toshimaru Nakamura/Cor Fuhler/Tsugami Kenta/Aoki Taisei/Okura Masahiko/Ishikawa Ko/Unami Taku/Takara Kumiko/Kahimi Karie/Mizutani Hiroaki/Yoshigaki Yasuhiro) Otomo Yoshihide's Invisible Songs – A23H/Otomo Yoshihide/Yoshigaki Yasuhiro/Kahimi Karie/Leonid Soybelman/Kondo Tatsuo/Nasuno Mitsuru/Kawai Shinobu/ Yamamoto Seiichi/ Jim O'Rourke 7k Oaks – A23H/Luca Venitucci/Massimo Pupillo/Fabrizio Spera Taste Tribes – A23H/Guenter Mueller/Hans Joachim Irmler/samples by Eruption & Kawabata Makoto Duo Gift Fig – A23H/Carl Stone Revolver 23 – A23H/Nicola L. Hein/Marcel Daemgen/Joerg Fischer MOTHER-OF-PEARL-SERIES (1.-5.,made in Korea), 2003–2006 [3]: Expedition (New York) – A23H/Chris Dahlgren/Jay Rosen/Hans Tammen Homura Trio (Seoul) – A23H/Yoriyuki Harada/Choi Sun Bae Dead Country (Istanbul) – Şevket Akinci/Umut Çağlar/Murat Çopur/Kerem Öktem/A23H The Expats (Tokyo) - Samm Bennett/Carl Stone/Kazuhisa Uchihashi/A23H concept recordings