Kassel, the city in the heart of Germany, internationally known as the city of the world art exhibition "documenta", which takes place every five years, also attracted international attention in the field of music when the then General Music Director Adám Fischer initiated the "Gustav Mahler Fest Kassel" in 1989. With the "Festspielorchester", an orchestra of it's own quality and characteristics was created. In addition to the concertmaster Rainer Hocke of the Vienna Philharmonic Orchestra, the oboe and clarinet groups of the Vienna Philharmonic Orchestra and the Vienna Symphony Orchestra were formed, whose instruments have special characteristics and thus a specific sound. The same applies to the horns, which play an important role in Mahler's music. The special string sound of musicians such as the Staatskapelle Dresden, the Czech Philharmonic Orchestra Prague, the orchestra of the Hungarian State Opera as well as the brass, especially trumpets, from German orchestras, supplemented by musicians from Brno, the Concertgebouw Orchestra Amsterdam as well as from Frankfurt, Hanover, Cologne and Düsseldorf, gave Mahler's music a particularly adequate sound. Of course, the Kassel State Orchestra, with a total of 20 musicians, who took turns, played a major role in the festival orchestra.