The Sacrifice of the Mass continues its textbook explanation of Mass in the Extraordinary Form of the Latin Rite. But this chapter doesn’t have anything in it that doesn’t apply to the Ordinary Form just as well.
The Introit for each Sunday Mass is still printed in Missalettes and other sources. But we just don’t get to hear it much, nor do most of us know that psalm verses are to be sung or recited along with it. The translation of the Gloria here is a good literal translation of the Latin; the official English translation does indeed leave out a lot, which is why we’re getting a new official translation Real Soon Now. So this is a very good chapter for anybody wanting to understand a Latin Rite Mass’ format or deepen their understanding of its spiritual riches.