Der Messias is the German version of Handel’s Messiah as arranged by Mozart. The translation dates from 1775 and is by Klopstock and Ebeling drawing heavily on the Lutheran Bible. My German isn’t good enough to say how “archaic” it sounds to a modern German speaker but it certainly seems to be quite singable. In any event it was presented in Salzburg during this year’s Mozartwoche in a staged version by Robert Wilson. The arrangement adds a substantial wind section and changes the voice parts in places. For example Doch wer mag entraten (But who may abide) is given to the bass rather than one of the high voices.