It is a symphonic work of great complexity, calling for a large orchestra, organ and choir, a supporting (distant) orchestra including a soprano voice, and a further piano on which the strings are played directly rather than via the keys.
Det er et symfonisk værk af stor kompleksitet, der kræver et stort orkester, orgel og kor, et støttende (fjernt) orkester, herunder en soprano stemme, og et yderligere klaver, hvor strenge spilles direkte i stedet for via nøglerne.