For the melody we use the triads a, b, c and d

a and c are 'minor' triads (1+2), b and d are 'major' triads (2+1).

The last six notes of the melody are an inversion of the first six notes. When you click with your mouse on the music example, you will hear a midi-file of this piece.

For the accompaniment we use triads we labelled as a’, b’, c’ and d’.

These triads are transposed a minor third lower than the triads we used for the melody. These triads occur as chords.

We avoid doublings in notes. The melody begin with triad a at the same time with d’ as chord. Together these triads have six different notes. No melody-note occur in the chord in the left hand. It is the same with triad b in the melody and triad a’ in the accompaniment, and the same with triad d and c’, etcetera.