I've mentioned before how much I like the Mundelein Psalter for providing English versions of the Latin hymns of the Liturgy of the Hours. I, for one, think it's wonderful to sing hymns by St. Ambrose or St. Gregory the Great during Sunday Vespers.
Unfortunately, the seasonal hymns are not laid out in an easy-to-read setting. By this, I mean that the notes are provided at the top of the page, rather than above the corresponding verses. This makes it rather difficult to follow. (There is an additional problem with the Vespers hymn of Easter missing a note, thus having only seven notes for an eight beat line of text, but that's another story)
I arranged an easier-to-read setting of Conditor Alme Siderum for our little Tallahassee group. I did not see this to be prohibited by the book itself, especially as we are not selling the material. Thus, we ought to be able to prepare easier for the transition from Ordinary Time into Advent. To set the chants, I used the font StaffClefPitchesEasy, which I find to be incredibly easy to use (round note chant notation).
This way, I think we will be able to continue using the Mundelein Psalter primarily, while supplementing it with other material when appropriate.