Within each movement are four harmonic sections in the keys of D, F, A and B ( or their relative minors ), similar to many of Reich's works; the reason being that the sections eventually return to the original key.
2.
A good example of this would be in the main harmonic sections of " Meihua Sannong ", where at the last three notes of the first two phrases all play sol ( first sol on the sixth string at 7th hui, second on third string at 9th hui, then again on the sixth string at 7th hui ).