''It's an experimental composition and features four big pieces sung by the cathedral choir, which are designed to really push the boundaries of choral music. It's by no means traditional, it's nothing like what one would ever hear sung at a church service.''
It included strange noises, screaming and shouting and some of the 22 choir members would be ''scattered throughout'' the cathedral, he said.
The choir would experiment with soundscapes, rather than melody.
A soundscape is a sound or combination of sounds that arises from an immersive environment.
The concert would include experimental music by composer Alan Starrett and performances by Puspawarna, the University of Otago Gamelan, and STRORK, an improvisational string group, who would perform a ''complete random jam''.
Chittenden would play organ piece De profundis, ''which, inadvertently simulates all the effects of an earthquake - it is a vast, gargantuan piece.''
The concert would include a light show highlighting choir members and various parts of the cathedral's architecture, he said.
