1999
 Ernst Krenek portrait concert in Vienna – concert performance of Friedrich Cerha’s stage piece "Netzwerk" at Wiener Festwochen – premiere of Olga Neuwirth’s audio theatre piece "Bählamms Fest" at the Wiener Festwochen – Peter Eötvös project in Vienna, Basel and Stuttgart – Robert Suter birthday concert in Vienna – at the Salzburg Festival world premiere of Luciano Berios, including the world debut of the "azione musicale" (opera), "Cronaca del Luogo" (written especially for Klangforum Wien) as well as concert projects ("Progetto Pollini”) – concert for the celebration of "100 Years of the Graz Opera" – further concerts in Austria include performances at musikprotokoll Graz, Hörgänge as well as Wien Modern – new performance of "La Vie Parisienne" by Offenbach in Berlin – concerts at Wittener Tage für Neue Kammermusik, in Weimar, Bremen and Komponistenforum Boswil – CDs featuring works by Furrer, Scelsi, Rihm, Neidhöfer, Lopez, Gadenstätter, first CD production with label KAIROS: Hans Zender’s "Schuberts Winterreise" – Vera Fischer (flute) becomes a member of the ensemble.

1998
International engagements in Seville, Berlin, Cologne, Brussels, Zurich, Wiesbaden, Budapest, Lisbon, at the Schleswig-Holstein Musikfestival as well as "Octobre en Normandie” – "La Vie Parisienne” by Jacques Offenbach in a collaboration between Sylvain Cambreling and Christoph Marthaler at the Wiener Burgtheater, Volksbühne am Rosa Lusemburg-Platz in Berlin and Bonn Opera as well as a CD-production – further CD-recordings of compositions from Barraqué, Scelsi, Mundry and Lachenmann – portrait concert and CD recording of Georg Friedrich Haas at ORF in Vienna – further concerts in Austria: Schönberg Festival in Vienna, Lange Nacht der IGNM at Wiener Konzerthaus (with conductor Dominique My making her Klangforum debut), Osterklang, Klangspuren Schwaz, musikprotokoll, Bregenz Festival, Wien Modern and the Salzburg Festival – International composers workshop at the Arnold Schönberg Center.
 
1997
 Gösta Neuwirth portrait concerts in Berlin and Graz – performances in Rome, New York, Moscow, St. Petersburg (Festival "Petersburger Frühling” focusing on Austria), Bielefeld, at Biennale Neue Musik, Hanover, Tonhalle Zürich, Centre Pompidou, Bregenz Festival, Salzburg Festival and Zeitfluss Festival (performances including Karlheinz Essl portrait concert), Schleswig Holstein Festival, musikprotokoll in Graz (including a celebration of 30 years of musikprotokoll), in Krems, Tage für zeitgemäße Musik Bludenz as well as Wien Modern – Tour of Japan (Tokyo, Osaka; Akiyoshidai-Festival, Theme: "Austria 1897–1997”) – Sophie Schafleitner (violin) becomes a member.

1996
 "Klangforum Festival” at the Odeon with works by Michael Jarrell, Heinz Holliger, Isabel Mundry, Wener Dafeldecker, Hanspeter Kyburz, Björn Wilker, Wolfram Schurig, Jürg Wyttenbach and Burkhard Stangl – birthday concert for Friedrich Cerha and György Kurtág at Wiener Konzerthaus – international performances in, amongst others: Berlin, Seville, Geneva, Zurich, Lucerne, Stuttgart, Oslo, Venice, Antwerp, Schleswig Holstein, Saarbrücken, Hombroich, Jerusalem and Witten – concerts in Austia at the Festivals Hörgänge (Vienna), IGNM Festival Vienna, musikprotokoll (Graz), Brucknerfest Linz, International Summer Academy Mozarteum Salzburg (Cerha Portrait), Bregenz Festival (first performance of Georg Friedrich Haas’ opera "Nacht”) – at the Salzburg Festival concerts as well as music theatre: Schönberg’s "Pierrot Lunaire” and Messiaen’s "Quatuor pour la fin du temps” in a production by Christoph Marthaler and Anna Viebrock – Sasa Dragovic (trumpet) joins the ensemble.

1995
The celebration "Ten years of Klangforum Wien" is marked with special projects at the Wiener Konzerthaus, in Graz and Witten – Festival "Französische Streifzüge” at the Konzerthaus with works by Jean Barraqué, Pierre Boulez, Tristan Murail, Olivier Messiaen and Maurice Ravel; Jürg Wyttenbach, Beat Furrer and Sylvain Cambreling (for the first time) conduct Klangforum Wien – portrait of Olga Neuwirth in Bremen ("Bremer Podium”) – "turned matters—into sound” in the Kunst.Halle.Krems – Zemlinsky-project at the Salzburg Mozarteum – further performances in Schaffhausen, Brussels, Ferrara, Berlin, Gotha, Jena, Leipzig, Magdeburg, Strasbourg, Frankfurt, Bludenz, Donaueschingen, Witten, Essen, Royaumont, Milan, Warsaw, Zurich, Stuttgart, Triest, Huddersfield, Reggio Emilia, Prague, at the Bregenz Festival, Zeitfluss/Salzburg Festival, musikprotokoll and the Biennale in Venice – Lorelei Dowling (bassoon) and Markus Deuter (oboe) join the ensemble.

1994
Seventy-eight international concerts – Varèse-Festival (Direction: Arturo Tamayo; Klosterneuburg (Schömerhaus), Wien, Graz, Bratislava) – concert at the Centre Georges Pompidou in Paris – concert for the 75th birthday of Roman Haubenstrock-Ramati – project "Zweite Wiener Schule” ("Second Vienna School”) with Friedrich Cerha – composers seminar "Mouvements – Komposition und Interpretation” in Vienna with Sylvano Bussotti, Peter Eötvös, and Helmut Lachenmann lecturing – Austrian premiere of Zender’s "Schuberts Winterreise” at the Wiener Festwochen; Tour: Wiesbaden, Berlin and Amsterdam – three concerts at the Darmstädter Ferienkurse für Neue Musik – Salzburg Festival/International Summer Academy Mozarteum: Mauricio Kagel conducts Klangforum Wien for the first time – two concerts at the Bregenz Festival – Internationale Musikfestwochen Luzern – Warschauer Herbst (Warszaw Autumn) – steirischer herbst – Züricher Tage für Neue Musik – Tage für Neue Musik Stuttgart – Premio musicale Città di Trieste – wien modern: Furrer, Rihm, Feldman – Huddersfield Festival: Debut of H. K. Gruber as conductor of Klangforum Wien – Bernhard Zachhuber (clarinet), Dimitrios Polisoidis (viola) and Marino Formenti (piano) become ensemble members.

1993
 More than 60 performances in Austria and the world – project "Klangnetze" at Wiener Konzerthaus – concerts in Cuenca (Spain), Barcelona, Venice (Biennale Festival), Stuttgart (Kammertheater), Rome (Nuovi Spazi Musicali), Salzburg (Zeitfluss/Salzburg Festival), Frankfurt (Alte Oper), Graz (musikprotokoll; first collaboration with Arturo Tamayo at the Festival "Farben der Seele”), Bologna, Triest, Lugano, Berlin (Insel Musik) – Première of Olga Neuwirth’s "Lonicera Caprifolium” – Austrian premiere of George Lopez’s "Blue Cliffs” – Scelsi-Tour: Brucknerfest Linz, Tage für Neue Musik Bludenz, Graz and Bratislava – Zender-Tour: Hans Zender conducts Klangforum Wien for the first time, in Bratislava, Wien and Brussels; works by Boulez, Essl, Zimmermann and Zender – Johannes Kalitze makes his debut as conductor of Klangforum Wien at the Konzerthaus (with pieces by Lachenmann, Billone and Kalitzke) – Christoph Walder and Björn Wilker become members of Klangforum Wien.

1992
Twenty-two concerts in Austria and abroad – from August Peter Oswald leads Klangforum Wien; the foundations for a year-round, internationally operating ensemble of soloists are laid – world premieres and Austrian debut performances of works by Wolfgang Rihm on the occasion of the Kocherscheidt Exhibition at the Secession – guest performances in Budapest – collaboration at the Graben Festtage under the motto "Entartete Musik" with works by Toch, Krenek, Schulhoff, Eisler, Schmidt, Hindemith, David und Webern – three concerts at Wien Modern (Kühr, Schwertsik, Henze) – guest performances in Duisburg with pieces by Cerha, Apostel, Ligeti, Schreker, Essl, Haubenstock-Ramati, Winkler, Furrer, Webern, Schönberg, Stankovski, Gadenstätter, Neuwirth, Schurig, Haas, Ligeti, Ablinger and Herndler – Florian Müller (piano) becomes an ensemble member.

1991
Zwenty concert performances and two opera productions (Beat Furrer and Olga Neuwirth) – Klangforum Wien constitutes itself as an association with Roman Haubenstock-Ramati and Beat Furrer as presidents – spanish debut in Madrid – Eva Zwicker (later Furrer, flute) makes her ensemble debut – concert performance of Beat Furrer’s opera "Die Blinden" at the Wittener Tage für Neue Kammermusik, recording released on CD – two single act operas by Olga Neuwirth/Ekfriede Jelinek ("Körperliche Veränderungen”/"Der Wald") at the Wiener Festwochen.

1990
Sixteen concerts at the Secession and also at the Vienna Konzerthaus, where an individual series of Klangforum Wien concerts has been held since the 1990/91 season – premiere of "Beaubourg Musique” by Haubenstock-Ramati – first performances by Gerhard E. Winkler, Christoph Herndler, Roland Faber and Mathias Spahlinger – Guillermo Büchler (violin), Roberto Fabbricciani (flute), Lucas Fels (cello), Ernesto Molinari (clarinet), Philippe Racine (flute) and Marcus Weiss (saxophone) playing, amongst others, works by Mauricio Sotelo, Peter Böhm and Luigi Nono – guest performances in Erlangen – ensemble debuts by Andreas Lindenbaum (cello), Dimitrios Polisoidis (viola) und Andreas Eberle (trombone) – Primavera Gruber becomes manageress of Klangforum Wien in June.