Lay people are encouraged to pray the Divine Office daily. (Clerics are generally required to pray it.)
Suppose you want to chant the office, or at least the psalms. It’s easy to find chant in Latin, but what if you want to chant the office in English? It isn’t so easy to find good resources for that.
But which tone do you use with each psalm? For the longest time, I used the first four on even numbered weeks and the second four on odd numbered weeks, just taking them in order.
Then I discovered a table that someone created based on the tones used in the Psalterium Monasticum assigning a tone to each psalm.
Here is a nice post over at St. Corbinian’s Bear in which the Bear has posted about chanting the office. He is coming at it from the Benedictine tradition, but it is available to everyone.
It would certainly make a good lenten devotion.