No other work by Mozart is so enshrouded in myth as his final composition, the D-minor Requiem. Mozart died before its completion, and the missing sections had to be added by others. The many handwritten copies circulated afterhis death added to the corruption of the text by contributing errors of their own.

Now Peters is publishing a new urtext edition of this staple of the choral repertoire, edited by David Black. The edition relies on Mozart’scomposition and the traditional completio...