Helmut Lachenmann
Gunnar Geisse has worked with or played works of Hans-Jürgen von Bose, John Cage, Peter Maxwell Davies, Fred Frith, Gérard Grisey, Hans Werner Henze, Tom Johnson, Helmut Lachenmann, Anestis Logothetis, Chico Mello, Josef Anton Riedl, Gioacchino Rossini, Dieter Schnebel, James Tenney, Kurt Weill, Jörg Widmann, Christian Wolff, and Udo Zimmermann.