The organ ties everything together, serves as an anchor. There are couple roles that does not chnage throughout the piece. The pedals doubles only the bass parts, alternating between first and second bass section. The right hand plays the M-voice in different transpositions (different intervals such as 3rds and 10ths). The left hand serves as a T-voice for the right hand, playing on the off beats and alternating between superiror and inferior 2nd position.
The percussion is merely used as a coloring tool, to accentuate begininngs of phrases or new verses, which given a very concrete structure to the piece. Tying every other element together.
Here is a detailed analyses of which section serves as a T-voice and which section has the M-voice in each verse:
Verse I
1. Sentecen - Bass II. M-voice, ascending from
Verse II
1. Sentence - Tenor I. M-voice, descending towards
2. Sentence - Bass I. M-voice, ascending towards
3. Sentence - Tenor II. M-voice, descending from
Verse III
1. Sentence - Bass I. T-voice, 2nd position, superior
- Bass II. M-voice, ascending from
2. Sentence - Tenor I. M-voice, descending towards
- Tenor II. T-voice, 2nd position, inferior
Verse IV
1. Sentence - Tenor II. T-voice, 2nd position, superior
- Bass II. M-voice, ascending towards
2. Sentence - Tenor I. M-voice, descending from
- Bass I. T voice, 2nd position, inferior
Verse V
1. Sentence - Tenor II. M-voice II, octave and a 5th up from M-voice I
- Bass I. T voice, 2nd position superior to M-voice I (B II)
- Bass II. M-voice I
2. Sentence. - Tenor I. M-voice II, octave and a 5th up from M-voice I
- Tenor II, T-voice, 2nd position superior to M-voice I
- Bass I, M voice I