81.104Mini-composition exercise

Write a 32-bar piece moving from ordinary tonality into polychordal tension and back.

Requirements:

• first 8 bars use conventional harmony
• one ordinary upper structure that does not yet sound fully polychordal
• one separated-register triad-over-triad sonority
• one polychord with a common tone between layers
• one polychord featuring a major/minor 3rd clash
• one chromatic upper triad resolving by parallel semitone motion
• one section with fixed lower harmony and moving upper triads
• one section with fixed upper triad and changing bass
• one bitonal passage lasting at least four bars
• one rhythmic distinction between lower and upper layers
• one modulation achieved by introducing the destination key as an upper layer before transferring the bass
• final resolution must use significantly simpler harmony than the climax

The piece should sound like:

one world → two worlds → one world again.