Although Siebenkas was a fantastic organist he didn’t become 1st organist at St. Sebald’s in Nuremberg until 1774, quite past due in his existence. He is regarded as the last from the aged Nuremberg school as well as the conventions and customs from the organists and Kantors of the town passed away with him. As students he discovered from Fortsch, Heinichen and Gruber. When Siebenkas performed before August the Solid as well as the Prussian Ruler Friedrich Wilhelm I who was simply present along with his child — later on, Frederick the fantastic — he was praised for his achievements. As an instrumentalist, Siebenkas also performed the German flute and key pad.