[vox_freedom]

>>Are there Mass impropers?

Ha. Actually quite a few.

You probably know this but, "The Introit, along with the Collects, Epistle, Gradual, Gospel, Offertory, Secrets, Communion Verse, and Postcommunions change from Mass to Mass depending on the Sunday or the Feast Day being celebrated. These parts of the Mass that change are called the "Proper Prayers" or simply the "Propers."
With a tip of the miter to: fisheaters.com

[GSlob]

With my tip to Ambrose Bierce.

[Robert Drobot]

vox - We're of the same mind.....it's already one of my 'Favorites' links. But, thank you anyway, friend.

http://www.fisheaters.com/beingcatholic.html