91.107Apply it to “Happy Birthday”

Use the melody as primary layer.

Do not complicate it much.

Create a secondary accompaniment rhythm derived from one short gesture in the tune.

Phrase 1: secondary rhythm mostly answers.

Phrase 2: it overlaps more.

Phrase 3: climax—brief rhythmic synchronization.

Phrase 4: secondary rhythm drops out.

Final cadence: melody arrives alone first.

This demonstrates counterpoint without obscuring the tune.