66.89Mini-composition exercise

Write 24 bars where the main melodic material is derived from guide tones.

Requirements:

• one ii–V–I
• one I–VI7–ii–V
• one dominant chain
• one minor iiø–V–i
• one tritone substitution
• one backdoor cadence
• one borrowed IV→iv→I
• one chromatic approach to a guide tone
• one outside phrase that lands on a guide tone
• one passage where roots are omitted entirely
• two independent guide-tone lines at the climax

The piece should remain harmonically understandable even if the bass is removed for several bars.