Crux Fidelis from Four Orchestral Chants View cart “Crux Fidelis from Four Orchestral Chants” has been added to your cart. $120.00 This piece is based on a Good Friday plainsong and the Stabat Mater. Given the subject matter, this piece is quite challenging harmonically. Crux Fidelis from Four Orchestral Chants quantity Add to cart Categories: Digital Score, Orchestra Description Score and parts.