Catholic court church. His first major work in Dresden was a Mass, the Missa Sanctae Caeciliae (c. 1711). Zelenka's music must have impressed the court, because only a few months after his arrival in Dresden his salary was increased to 350 thalers. This placed him among the most highly paid musicians in the Hofkapelle. Three years later, it was raised to 400 thalers. Vienna In 1716, Zelenka continued his education in Vienna under the Habsburg Imperial Kapellmeister Johann Joseph Fux. It is unlikely that he visited Venice as once thought. A Saxon court document of 1715 records a royal cash advance for a trip to Italy by Zelenka with his fellow musicians and composers Pierre (Peter) Gabriel Buffardin, Johann Christian Richter and Johann Georg Pisendel. New documents confirming the arrival of the oboist Richter and violinist Pisendel in Italy have now surfaced but neither Zelenka nor Buffardin were travelling with them. Back in Dresden in 1719, he remained there except for an extended stay in Prague in 1722-3, when he conducted the première of one of his major secular works, Sub olea pacis et palma virtutis conspicua orbi regia Bohemiae Corona (a melodrama about St. Wenceslas), at the time of the coronation of Charles VI. While in Prague he composed some of his highly original instrumental works, as seen in the autograph of the score of Concerto à 8 Concertanti — "Six concerti written in a hurry in Prague in 1723" (ZWV 186, 187, 188, 189). In the early 1720s, Zelenka composed some of his finest works like the Responsoria pro hebdomada (ZWV 55) and the Lamentations (ZWV 53). His compositions still constitute an important part of the repertoire of the Catholic court church. Following the frequent illnesses of Kapellmeister Johann David Heinichen, Zelenka gradually took over the direction of the sacred music. In January 1726, he began entering his own works and those of others he collected into a register called Inventarium (1726-39), one of the most important documents of Dresden baroque music. In July 1729, Heinichen died and Zelenka became acting Kapellmeister, a position he occupied in an unofficial capacity until 1734. This period is known as the Interregnum, a term coined by Professor Wolfgang Horn. The first work that confirms Zelenka's new status is a Sinfonia (ZWV 190, 18 May 1729, previously known as Capriccio), which, as Janice B. Stockigt has established, was performed at a Gala