I misplaced my hard copy of this, went searching online for it without success, and thought about asking the forum if anyone had it. Then I found it on an old hard drive. Thought I would share since it seems no longer to be online anywhere. I can't remember where I found it in the first place.

These sparse accompaniments for the Office psalm tones are wonderful. The late Jean Claire had a profound understanding of Gregorian modality. He considered organ accompaniment a "necessary evil" in a monastery and evidently felt that existing formulae for accompany the psalms were inadequate, leading him to create his own.