@d_j, the book (the new 2nd volume) is sold at this web site from the monastery in Flavigny:

http://www.traditions-monastiques.com/en/christian-catholic-spirituality-french-books-for-sale/1697-laus-ecclesia-tome-l1151f.html?search_query=laus&results=7

Actually, I'm not sure from the context whether the new book is a replacement for the 1st book or an addition to it: a second volume, so to speak.

As an illustration of the content of the 1st edition, a description is on-line:
http://www.schola-st-gregoire.org/index.php?option=com_content&view=article&id=73

There's a cheat-sheet on the modes:
http://www.schola-st-gregoire.org/documents/Aide-mémoire_psalmodie_Laus_in_Ecclesia_tome_2.pdf

And a sample chapter from volume 1:
http://www.schola-st-gregoire.org/documents/Laus_in_Ecclesia_Lecon_7.pdf

The idea behind the book is that you'd enroll in the course, send the homework to the Schola for review and evaluation, and visit France for a week in July for in-person guidance and evaluation.

From their description (translation by Google)

This first volume is an introduction suitable for all those new to the Gregorian chant and want to practice. This teaching focuses on four main themes: the text, melody, rhythm and style.
Two other volumes seem to be for the singers and the choir masters wishing to improve in the liturgical practice of Gregorian chant.

I think Google has mistranslated the last sentence, which should begin: "Two other volumes will appear" Unless your French is excellent, I would wait for the proposed translation.

They have been working very hard to develop a Laus in Ecclesia publication in English - no small undertaking...

I think the only other course that might cover similar material (and I'm just guessing) would be our Chant Intensive courses. However, we cover a lot of material in a much shorter time, so the amount of depth we can go into will be less, of course. From what I understand from Fr. Bachmann, the Solesmes course has five levels of instruction -- if I recall correctly, the first two levels are intended for basic chant singing, followed by a course for cantors and with the final two levels devoted to direction of chant.

The Laus in Ecclesia books are the updated version of Schola St Gregoire Gregorian chant course, as mentioned previously, you get the book, do the study and exercises, then do a study week in France with exams for a certificate from the pontifical academy of music.
This is a five year program. the books for the first two years are already translated into English (the older version) and I have them, I went to the study week this summer. Although my french is weak, it was an amazing week with a very very high standard of chant. There were people studying at all five levels, which go from beginner through to choir director level there is also a choriste level for young religious,so there was the joy of meeting young monks and nuns from barroux, fontgombault, solesmes, and several other new and old orders, as well as lots of lay people. the setting for the week in Chappelle Montligeon is superb.
I strongly recommend both the study course and the study week.

The new publication of the first book is in the works right now... it should be very nice if you care to wait a bit longer. You could also participate in their planned course...

Hi Janet, is the English version of Laus in Ecclesia available yet? I hope to go back to france this year to study the course, and it would be a great help as my french is weak.

@ JanetGorbitz... hi, is the Laus in Ecclesia level one book available for purchase somewhere? I intend for it to be a self study course. Thank you!

Laus in Ecclesia book one has been published by now. It covers the first year (notation reading, latin prononciation and accent, rhythm and some culture about chant and the mass with additional biographies of people who restored/taught chant). The French edition of book 2 covers years 2 and 3. In the most part, the second year introduces modality and melodic transposition, and teaches the psalmody. The third year covers the rhythm in syllabic phrases and recitatives, more advanced modal analysis and complements. Book 3 (not even published in French) should be fore choirmasters and cover years 4 (conducting) and 5 (advanced knowledge).
It is a god thing however to get some guidance on how to perform the exercises.

I know that work on Book 2 has been a major focus, but don't know it if will be ready in time for the summer courses. However, Laus in Ecclesia II will be taught this summer at the summer courses in Gainesville by Fr. Mark Bachmann even if the book is not yet ready. Still time to register with early rates...