The books were compiled for the Pieterskerk's Zeven-Getijdencollege (College of the Seven Liturgical Hours), a professional choir employed at the Pieterskerk, as at many large Dutch parish churches during the 15th and 16th Centuries, to celebrate the officium divinum as well as masses for the dead - or rather those of the dead rich enough to have had left bequests and endowments for masses to be sung for them.

Rotterdam, Delft in both churches, Haarlem, Gouda, Alkmaar, and finally Amsterdam (as late as 1468) also set up dedicated "college" choirs.

The Leiden books themselves survived the iconoclasm of 1566 when a mob burst into the Pieterskerk and ransacked it.

Apart from works by renowned masters such as Clemens non Papa, Crecquillon, Josquin des Prez, Johannes Lupi, and Jean Richafort, the books also include anonyma and compositions by less well-known Flemish and local composers, such as Claudin Patoulet, Joachimus de Monte, and Johannes Flamingus.

[1] The Egidius Kwartet recorded major pieces from the 6 choirbooks in 6 annual 2CD releases from 2010-2015.