The eleven fragments of this music can be performed as one or two solo works or as a duet. When performed as a solo, the music centres around a slowly morphing hexachord. Each solo focuses on a different, but always complementary, set of pitches. When performed as a duet, the music is a twelve-tone piece. The title of the piece is the Zoroastrian mantra, meaning ‘Good Thoughts, Good Words, Good Deeds’. The competing but complementary ideas of dark and shade that can be found in this—as many other—philosophies find a parallel in the complementary parts of the piece that can be heard together, or separately. Beyond this, however, the title also refers to the mantra-like and contemplative nature of the music as it is realised, either separately or together, by the musicians.

https://research.gold.ac.uk/id/eprint/24875