Target: Explain how F’s lower half-note line overlaps its upper quarter-note line, and compare the texture with upper voice alone.
Prepare: F, two rows of eight tactile or paper cells; optional F WAV.
- Launch · 2 min. Ask whether “two notes written vertically” means they occur one after another or together. Point to matching starts.
- Model · 4 min. Read upper E4, G4, E4, D4 on beats 1–4; lower C3 holds beats 1–2 and G3 holds beats 3–4. The lower line is quieter in the score.
- Guided looking · 5 min. Mark simultaneous events at beat 1 and beat 3. Compare two distinct lines with one lone line; avoid attaching a genre label.
- Practice route · 7 min. Realise or represent F, then remove the lower row. Identify one event that is no longer sounding and explain how that alters the evidence for thickness/texture.
- Audit · 4 min. Confirm both voices independently fill four beats and that a learner did not sum them into eight sequential beats.
- Exit · 3 min. Collect a two-row timeline and a “with/without lower voice” evidence statement.