I am always on the search for a new or old setting of the Mass Ordinary in unison or for equal voices that could be sung by my choristers. However, what does one do when his choristers are on break? The answer, of coarse, is to find the same kind of work, only for male voices, and Kevin Allen’s Missa Rex Genitor fits the bill. I first heard it sung by the gentlemen of the Madeleine Cathedral Choir in Salt Lake City. It is a serviceable piece of music, although almost too Medieval sounding for my ears, but it is worth singing. If your choir can’t sight-sing (why is that?!), or you have new singers who struggle, the rehearsal tracks found on Mr. Allen’s website can be helpful.