Good liturgical reasons

Holy Roman Emperor Joseph II

The Holy Roman Emperor, Joseph II was a man of the Age of Reason.  He sought to bring about far-reaching church reforms in the German-speaking world. These are referred to as Josephinism, and they included making the church services more accessible to the layman, modelled on some of the ideas of the Protestant Reformation. There were to be hymns sung in German, musical settings should be as brief as the text allowed, and there should be no purely instrumental music. In the pursuit of brevity, to shorten the long text of the Creed, it became the practice to sing several lines of text simultaneously. 

There was some controversy over the appointment of Archbishop Colloredo. The local ‘favourite’ for the position was the conservative current Dean of the cathedral, but Colloredo was a keen advocate of Josephinism, so he was appointed over the Dean’s head. Altogether it proved something of a poisoned chalice.