The performance material of the pioneering completion of Mozart's great Missa in c K. 427 by the Dutch musicologist Clemens Kemme is now completed with a choral score. The reconstruction, seen by many international experts as the most convincing solution, especially in the double-choir "Sanctus" fugue, thus becomes affordable for larger choirs. The compact and clearly arranged choral score is also considerably lighter than the piano vocal score; cue notes provide good orientation within the work.