Shearing, Colin R.Gregorian Chants. an Illustrated History of Religious Chanting. Mercury Books 2004 1904668526 / 9781904668527 Hardcover New in Fine dust jacket 139pp, many colour illustrations. HEAVY BOOK, extra postage will be requested for delivery outside UK. Traces the tradition of chanting from the early 9th century under Pope Gregory the Great and its subsequent central place in the liturgy. Accompanying CD with performances of 16 chants ranging from the Salve Regina to Psalm 110.