Intervals and Triads Below the Melody

After this lesson, you will be able to add thirds, sixths, or triads below notes in the project melody, verify that every original top note remains unchanged, and choose density according to register, phrase motion, and the current chord symbol.

The top note is a binding contract

When harmonizing below melody, the highest pitch and duration of every event must match the source. Measures 1–4 have top notes E–G–A–G | A–E–C–E | D–F–A–F | D–F–G–D. A4 over C is a sixth color; E4 beneath A4 does not change the melody or chord symbol.

Read each vertical event from the top down: identify melody, current chord, then one or two lower chord tones. Never begin from a convenient hand shape and accidentally place G4 above melody E4. Melody remains the outer voice both visually and aurally.

Thirds, sixths, and triads carry different weight

Thirds make a compact texture and often voice-lead easily. Sixths open more space. Triads state quality more fully but add density. The score reserves three-note attacks for selected G7 or structural points and uses dyads elsewhere.

Vary interval according to chord tones and voice leading. Hold common tones or move lower voices by small steps where useful. On G7, B3–D4–G4 over G2 omits F at that instant, but F4 appears on the preceding attack, so the measure presents the seventh-chord color over time.

Register and balance keep melody exposed

Bass occupies G2–D3, inner harmony begins at A3, and melody spans C4–A4. When melody reaches C4, a complete closed triad cannot sit beneath it cleanly; use A3 alone or leave C4 unaccompanied. Fewer purposeful notes beat a thick voicing that crosses the top.

Give melody fingers slightly more weight and play inner voices quietly but simultaneously. Practice ghosted inner parts. Do not use pedal to fuse disconnected voicings; connect by finger where practical or allow breath.

Audit each event away from tempo. Play the top note alone, add the lowest inner note, then add a third pitch only if it improves harmonic clarity. This subtraction-first check prevents a familiar triad shape from becoming the default response to every melody note.

Exercise

Complete project measures 5–8 over C–Am–F–G7. Write the source top line first in one color and lower notes in another. Make a sparse dyad version, then one allowing at most two triads per measure. Compare clarity and retain triads only where they improve the phrase.

Common mistakes

• Symptom: A chord tone rises above melody. Correction: Write top notes first and choose only lower pitches.
• Symptom: Every beat receives a full triad. Correction: Mix single melody, dyads, and selected triads.
• Symptom: Correct melody disappears dynamically. Correction: Rehearse top at moderate forte and inner voices pianissimo.

Frequently asked questions

Must every melody note be a chord tone? No. A4 over C is a directed sixth color moving toward G4.

How do I fit a triad below C4? You need not. Use bass plus A3, or leave C4 alone.

Are sixths always better than thirds? No. Sixths open register; thirds may voice-lead more smoothly.