Bach, who stayed remarkably healthy for most of his life, began losing his sight toward the end to the point that the unbearable pain and hindrance to his work led him to undergo an eye operation by the noted English oculist John Taylor, who was lecturing in Leipzig in March 1750. Though the operation initially seemed successful, a second operation had to be performed, which might have helped had not the post-operative procedures of the day weakened Bach’s entire system, causing total blindness, fever, and—ten days before he died—a stroke. Only at this point did Bach realize that death was near.

Sometime during his last week, Bach’s thoughts turned to Wenn wir in hochsten Noten sein (When we are in greatest need), BWV 668, a 45-measure chorale prelude that he had expanded from his 12-measure chorale setting c. 1712–13 of the same name (BWV 641) and included in the Orgel-Büchlein. The expanded work belongs to the collection of chorale preludes known as the “Great Eighteen,” revised c. 1739–42 in Leipzig. As Bach lay on his deathbed, apparently having asked an organist friend to play the chorale prelude for him, he began thinking about the original sixteenth-century melody that had also been sung to the words “Vor deinen Thron tret’ ich hiermit” (“Before your throne I now appear”) and that their complementary texts perfectly suited his own end-of-life thoughts. Ever the earnest perfectionist, he realized even then that he wanted to make several improvements prior to standing in judgment before his God.

Bach dictated the tweaks to a student, and apparently the same student or another copyist made a fair copy of this slightly revised version at the end of a manuscript of organ works in Bach’s hand that included revisions to others of the Great Eighteen. (Unfortunately the last page of that copy disappeared at some point.) The year after Bach’s death, his son Carl Philipp Emanuel—who knew that his father had been tinkering with BWV 668 on his deathbed—issued The Art of Fugue with this chorale prelude at the end, thinking it a more fitting conclusion than the final four-voice fugue that the elder Bach had left incomplete. Not knowing about the dictated revisions, C.P.E. simply included BWV 668 as it had appeared earlier but with the new title, Vor den Thron tret’ ich hiermit. In either version Bach demonstrates his great artistry, and his deathbed revisions stand as a testament to his continual striving for perfection.

The work, heard this afternoon in the four-cello arrangement made by the Finckel Cello Quartet, presents the four phrases of the chorale melody in the upper voice, each preceded by a fugal exposition based on what eventually appears as counterpoint to that section of the melody. Bach’s brings contrapuntal mastery to his fugal entries by incorporating inversion (mirror image of intervals) and, toward the end, diminution (shortened note values). A nice harmonic diversion dramatically sets up the final chord.

—©Jane Vial Jaffe