S—Alois Schmitt—1901—Made cuts in “Laudamus te” and “Et incarnatus est”; added flutes and clarinets in “Gloria in excelsis Deo”, “Qui tollis”, “Jesu Christe”, “Cum Sancto Spiritu”, and “Credo in unum Deum”; filled out strings in “Credo in unum Deum” and “Et incarnatus est”; expanded choirs to 8 parts in “Sanctus” and “Hosanna”; completed mass by adding sections of masses by Mozart and others. 3 recordings
R—H. C. Robbins Landon—1956—Restored cuts in “Laudamus te” and “Et incarnatus est”; removed flutes and clarinets; revised strings in “Credo in unum Deum” and “Et incarnatus est”; retained double-choirs; removed sections not written for this mass; no added instruments. 11 recordings (and probably 10 others without attribution)
E—Helmut Eder—1985; revised strings in “Credo in unum Deum” and “Et incarnatus est”; added horns in “Credo in unum Deum” and “Et incarnatus est”. 7 recordings
G—John Eliot Gardiner—1986 (from Schmitt—like Robbins Landon). 1 recording
M—Richard Maunder—1988—Revised strings in “Credo in unum Deum” and “Et incarnatus est”; added trombones, trumpets, timpani, and horns in “Credo in unum Deum” starting at the 2nd measure; added horns in “Et incarnatus est”. 4 recordings
B—Franz Beyer—1989; revised strings in “Credo in unum Deum” and “Et incarnatus est”); reworked “Kyrie” music into an “Agnus Dei”. 3 recordings (none that includes “Agnus Dei”)
W—Philip Wilby—2004; Completed missing sections from movements of “Davidde Penitente”; reworked “Kyrie” for “Agnus Dei”, reworked “Cum Sancto Spiritu” for “Dona nobis pacem”. No recordings
L—Robert Levin—2005—Added trombones, trumpets & timpani in “Credo in unum Deum” starting at the 1st measure; used Mozart’s new parts of “Davidde Penitente” for “Et in Spiritum Sanctum” and “Agnus Dei”; composed “Crucifixus”, “Et resurrexit”, “Et unam sanctam”, “Et vitam venturi”, and “Dona nobis pacem” himself from autograph fragments. 1 recording
La—Louis Langreé—2006—Added trombones, trumpets, and timpani in “Credo in unum Deum” starting at the 1st measure. 1 recording
C—Benjamin-Gunnar Cohrs—2010; completed missing sections by using Mozart’s new parts for “Davidde Penitente” and other Mozart works. No recordings
WB—Uwe Wolf & Frieder Bernius—2017—Added trombones, trumpets, and timpani in “Credo in unum Deum” starting at the 1st measure. 1 recording
K—Clemens Kemme—2018—Added trombones, trumpets, and timpani in “Credo in unum Deum” starting at the 1st measure; added unspecified instruments to “Et incarnatus est”; reworked double chorus in “Sanctus” and “Benedictus”. 1 recording.
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