The choir is the modern-day descendant of the boys' choirs of the Viennese Court, dating back to the late Middle Ages. The Wiener Hofmusikkapelle was established by a letter from Emperor Maximilian I of the Holy Roman Empire on 30 June 1498, instructing court officials to employ a singing master, two basses and six boys. Jurij Slatkonja became the director of the ensemble. The role of the choir (numbering between 24 and 26) was to provide musical accompaniment for the church mass. Additionally, the Haydn brothers were members of the St. Stephen's Cathedral choir, directed at the time by Georg Reutter II, who used this choir in his duties for the imperial court, which at the time had no boy choristers of its own.