Part of the Organ collection by J. S. Bach, this first book of the Volume X Three Chorals Transcriptions, Three partitas and canonical variations, book 1 (BWV 645, 646, 647, 766, 767, 768) contains six pieces and is completed by the second book.

The six pieces that feature in this book are three choral-transcriptions and three chorals with variations:
1. Awake, The Watchmen ery out
2. Whither shall I flee
3. He that suffereth God to guide him
4. Partite on Christ, Thou who Art the light of the day
5. Partite on O God, Thou Holy God
6. Partite on Hail to Thee merciful Jesus
This volume is translated in English and French and features the annotation of Marcel Dupré, a French Organist, to help the performer get the most our of the sheet music. The preface is also well written, with explanations of the comments and descriptions of the techniques to use for an accomplished interpretation of this work.