The schedule for holiday psalm readings according to the Vilna Gaon, as recorded in the Siddur Al Pi Nusaḥ haGra published by Mossad haRav Kook. The Vilna Gaon was very stringent in reciting only one psalm per day, and as a result his practice is very complex, with different psalms being said on the same holiday depending on the day of the week. . . .

The “minor tractate” Soferim is one of our best sources for early liturgical practice. It is the oldest known source for multiple practices still followed today, such as the blessing for the haftarah. Such luminaries as the Vilna Gaon considered it a vital work. But some of its practices are… well, odd. There are customs in Tractate Soferim which are found nowhere else in classical rabbinics — blessings for the recitation of books in Writings other than the scrolls, a three-year cycle of Torah readings, and a custom to divide the scrolls in half when reading them. This service is constructed based on the descriptions and passages of Tractate Soferim, mostly following the Gra’s edition. In some ways it may be very familiar, especially to Ashkenazim, but in others it is a fascinating glimpse into a heretofore lost practice of Judaism. . . .