Try another version of the second instrument

Original creative challenge · Listening between the notes

1. Use this invented starting situation: A new instrument enters beneath a familiar melody.
2. Follow that instrument for one short section.
3. Make a small artefact that shows the change: a note, sketch, caption, or three-panel sequence.
4. Write one sentence describing what the artefact makes clearer. Keep this an experiment; no account, purchase, or public post is needed.