The ‘MOB art & tone ART’ Ensemble made its debut in 1967 and played a lively role in Austrian musical life during the five years of its existence. All three of the composers who directed the Ensemble were also professional instrumentalists—Zykan as pianist, Gruber as double-bass in the Austrian Radio Symphony Orchestra, and Schwertsik as hornist in the Vienna Symphony Orchestra. Zykan and Gruber both appeared regularly with the Ensemble, whose other performing members were Volkcr Altmann (horn), Leonhard Wallisch (cello), Roland Altmann and Kurt Prihoda (percussion). The violinist Ernst Kovacic and the cellist Heinrich Schiff appeared with the Ensemble from time to time as guests.