My wife bought a Bärenreither edition of B-minor Mass vocal score for her own use, and I immediately noticed the difference in the content appearance: Mine is 1955 version while her's is 2010. I recall that the conductor mentioned the lack of the instrument indications in the new edition while we sang this music a couple of years ago, but the changes were more drastic. As you can see in the attached pictures, the timpani notes disappeared and there are fewer notes in the harmony in the 2010 copy. The older version simply packed all the orchestral parts, but the new version, I guess, focused on the arrangement for the keyboard accompaniment.
|Bärenreiter 1955 Edition|
|Bärenreiter 2010 Edition|