In 1688, he became a musician at the court of prince Maximilian Emmanuel, Elector of Bavaria who offered him the opportunity to study music under the leading Italian composer Arcangelo Corelli in Rome.
In 1694, Pez joined the court of Joseph Clemens, Archbishop-Elector of Cologne at his residence in Bonn, working to improve the prince's chapel orchestra.
[1] Thanks to the Duchy's financial problems thanks to the War of the Spanish Succession and the ongoing construction of Ludwigsburg Palace, the court retrenched, the singers and instrumentalists of the Hofkapelle reduced in number and Pez's salary lowered to 500 gulden.
[3] Nevertheless, Pez was, very worried about his small number of vocalists, the Catholic singers sometimes missing some church performances, though he never mentioned this to the Duke[4]).
[5] Eberhard Louis and his court were Protestant but tolerated Pez's Catholic faith[6] That faith also meant he was not required to provide housing for some of the court's choir boys (German: Kapellknaben) despite being their supervisor, leading to such a decline in their influence that by 1715 only two were still employed in the Hofkapelle.