Dsus4

Construction

Built from these intervals: 1-4-5.

A suspension replaces the third -- here the 4 takes its place. The 4 sits a half step above where the 3 would be, creating tension that wants to resolve downward. The 5 grounds the chord with consonance. This is a suspended chord, part of the suspended chord family.

Harmonic Function

In Roman numeral analysis (uppercase = major, lowercase = minor), sus4 creates anticipation that can resolve or sustain:

• Vsus4 to V -- classic suspension resolution before a cadence; the 4 drops to 3, activating dominant pull
• Isus4 to I -- adds motion to a static tonic, common in pop and hymn writing
• IVsus4 -- floating subdominant in rock and pop, often left unresolved
• Unresolved sustain -- in rock and folk, sus4 can hang without resolving, creating open ambiguity

Character

As a member of the suspended chord family, sus4 sounds expectant and tense. The half step between 4 and 3 generates anticipation -- something is about to happen. In classical harmony, sus4 always resolves. In rock and pop, it can hang indefinitely, becoming texture rather than transition. Compare to sus2: the 4 pulls hard toward the 3; the 2 sits a whole step away, content to float.

Related Sounds

These chords share the sus4's suspended foundation, each modifying one element:

• sus2 (1-2-5) -- nearest neighbor; 2 replaces 4, more open and less driven to resolve
• 7sus4 (1-4-5-b7) -- adds b7 for dominant weight. In a standard dominant chord, the 3 and b7 form a tritone (six half steps) that drives resolution. Because 7sus4 has no 3, that tritone never forms -- it can vamp indefinitely in funk
• 9sus4 (1-4-5-b7-9) -- adds b7 and 9, richer color while staying suspended
• maj (1-3-5) -- resolve the suspension: 4 drops a half step to 3
• add4 (1-3-4-5) -- keeps both 3 and 4, creating a deliberate half-step clash

Voice Leading

Voice leading tracks how individual notes move from one chord to the next. The defining motion of sus4 is 4 resolving down to 3.

• sus4 to major: The 4 drops a half step to the 3. The root and 5 hold. The classic suspension resolution.
• sus4 to minor: The 4 drops a whole step to the b3. The root and 5 hold. Sus4 resolves to minor just as naturally -- true major/minor ambiguity.
• Vsus4 to V7 to I: The 4 drops a half step to the 3 (suspension resolves), activating the tritone between 3 and b7 of V7. Then the 3 of V rises a half step to the root of I and the b7 drops a half step to the 3rd of I.

These movements apply in any key — the intervals are the same regardless of root.

Practice Seeds

Delay the resolution. Hold sus4 for several bars, then resolve to major. The half-step tension between 4 and 3 grows more insistent the longer you wait.

Resolve both ways. Play sus4 and resolve to major, then start again and resolve to minor. The third you choose determines everything -- this builds awareness of sus4's ambiguity.

Vsus4 to V7 to I. Insert sus4 before the dominant resolves. Feel how staged resolution -- suspension first, then cadence -- strengthens the arrival at tonic.

Quartal stacking. Play sus4, then add another 4th above the 5. Stacking fourths is the entry point into quartal harmony -- voicings built on fourths rather than thirds. Listen for how the open sound differs from triadic chords.