Here is a resource you just might never have seen if it wasn't for Pope Benedict XVI's Motu Proprio. 

Now if your parish wants to follow the model of St. John Cantius and offer both orders of the Mass, you can do so and you only need one missal!  (This book would also be great even if you aren't offering both ordos, but you are having a Latin Mass according to one form or the other.) Not only do you have the side-by-side Latin/English translation for both forms, but you also get the chants of the Kyriale (the parts the congregation ought to be able to sing in Latin according to Vatican II) and lot of chant hymns, several of which will be familiar to most Catholics (like Regina Caeli and Tantum Ergo) but lots more that they may not know or haven't heard in a long, long time, like Crux Fidelis or Ave Verum. 

No doubt people in the congregation will be daunted by the prospect of singing chant, especially when they see all those square notes (they are included in the standard chant notation in this book, not the modern notation you might find in a typical hymnal).  Well, they'll never get over their fears unless you give them a chance to open a chant book and look at the neumes while they sing.  The Parish Book of Chant puts the possibility of singing Gregorian chant at Mass into the congregation's hands.  There is even a brief tutorial to take the mystery out of the signs, rhythms, etc. 

I understand there is probably a Latin ordinary form Mass in our parish's future, and I can see The Parish Book of Chant being a valuable resource for helping it be a success.  I am also thinking of sending a copy of this home with every attendee of our Gregorian Chant Workshop this fall. 

The Parish Book of Chant was a labor of love from volunteers of the Church Music Association of America.  The world of sacred music is changing... the resources parishes draw on are going to be less from the big-name music publishers and more on offerings from groups like the CMAA.  And this is a very good thing.