The Sanctus is a six part chorus; the voices move for the most part in flowing triplets, the bass generally in an octave figure. After a time the triplets give way to the following powerful passage:
after a few bars of which the triplets are resumed.
“Pleni sunt cœli et terra gloria ejus,” is a six part fugue, and “osanna” is a double chorus. The “Dona nobis pacem” has the same opening passage as the Rathswahl cantata. The work from beginning to end is on a gigantic scale, in which each separate movement is a masterpiece from every point of view.
Chapter X
The Wohltemperirte Clavier—“The Art of Fugue”—“Musical Offering”—Bach as a Teacher—Bach’s Works in England.
The Wohltemperirte Clavier was gradually compiled and formed into a complete work in two parts. The first part was completed at Cöthen in 1722, and entitled “The well tempered clavier, or preludes and fugues through all tones and semitones, both with major and minor thirds. For the edification and use of young musicians who are eager to learn, and for the recreation of those who are already facile in this study. Collected and prepared by Johann Sebastian Bach, Grand-ducal Capellmeister and Director of Chamber music to the Court of Cöthen, Anno 1722.”
The Wohlt. Clavier intended for Clavichord