Section 2 of the norms says:
The Musical Chapel of St. Peter’s Basilica follows the norms of the Magisterium of
the Church regarding liturgical song, and especially the Chirograph of John Paul II
and the latest pronouncements of Benedict XVI in the matter of liturgical music.
It's too bad that most parishes across America fail to follow the Vatican's lead where liturgy is concerned.
In case any music directors stop by, here are the chants they use and when they are sung.
As a general norm, the chants from the Ordinary to be execute are:
Sundays of Advent: Missa XVII Credo IV
Sundays of Christmas: Missa IX Credo IV
Sundays of Lent: Missa XVII Credo IV
Sundays of Easter: Missa I Credo III
Sundays of Ordinary Time: Missa XI Credo I
Feasts of Ordinary Time: Missa VIII Credo III
Feasts of the B.V. Mary: Missa IX Credo IV
Feasts of the Apostles: Missa IV Credo III
So why not try what the Vatican recommends instead of turning to that OCP (the largest purveyor of bad music in America) missalette . You'll make Traddy smile if you do!