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← Learn·Suspended & Added-Tone Chords

Sus4, Add2, and Add4 Chords

Builds on Triad Construction as Stacked Intervals

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Suspended and added-tone chords modify a triad without using its 3rd the normal way — they replace or supplement it, producing an open, ambiguous sound that's neither clearly major nor minor.

A sus4 chord replaces the 3rd entirely with a 4th (root-4th-5th) — the missing 3rd is what makes it sound suspended, neither major nor minor, until it resolves (traditionally down to the 3rd). Add2 and add4 chords, by contrast, keep the ordinary 3rd but add an extra color tone on top — a 2nd or 4th — without adding a full 7th.

💡 Tip

If a chord sounds like a plain triad but with something 'else' hovering in it — neither a clear major nor minor color, nor a full seventh-chord richness — suspect a sus4 or add-tone chord before reaching for a more exotic explanation.

⚠️ Common mistake

Assuming any chord with a '4' or '2' in its name must be complicated. Sus4/add2/add4 are structurally simpler than seventh chords — they only ever contain three or four notes, no seventh involved at all.

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📝 Summary

Sus4 replaces a triad's 3rd with a 4th, sounding neither major nor minor. Add2/add4 keep the 3rd and add one extra color tone on top, without a full 7th.

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