Until recently, there were few options for singing all the propers in English during the Ordinary Form of the Roman Rite. This book of propers using psalm tones has been offered to make traditional plainchant available to the simplest choir or humblest cantor. Not only are the chants uncomplicated to begin with, but the tone is repeated from Sunday to Sunday so as to make preparation for Mass require less rehearsal time. If a choir wishes to sing more challenging music, they can sing the chant in four part harmony.