Part of the Organ collection by J. S. Bach, this 4th Volume Complete Organ Work - Six Sonatas in Trio form was composed in the 18th century. This volume is now translated in English and French and features the annotation of Marcel Dupré, a French organist, to help the performer get the most of the sheet music.

This fourth book contains the six following pieces:
- Sonata  E flat major
- Sonata  C minor
- Sonata  D minor
- Sonata  E minor
- Sonata  C major
- Sonata  G major

The preface of these Six Sonatas in Trio form is well written, with explanations of the comments and descriptions of the techniques to use for a good interpretation of this work. This volume can be used by intermediate players and above.