This beautifully crafted CD is a joy. The group Pomerium was founded in 1972 by Alexander Blachly with the purpose of performing "virtuoso chapel choirs of the Renaissance." The "Musical Book of Hours" is a concept record-an accompaniment to the medieval religious texts of the 13th to 16th centuries, and features works by Desprez, Ockeghem, and Du Fay. The fifteen-voice mixed group sings these gentle and fluid melodies with a delicacy and grace that caresses the ear, as well as the spirit. The detailed liner notes include several exquisite reproductions of the artwork from the period.