Sus4 Chords Explained

What is a sus4 chord?

A sus4 chord is a triad built from a root, perfect fourth (5 semitones), and perfect fifth (7 semitones). Like sus2, it lacks a third, making it neither major nor minor. But unlike sus2, the fourth sits just one semitone above where the major third would be, creating a noticeable pull downward. This tension — the fourth wanting to resolve to the third — is what gives sus4 its characteristic anticipatory quality.

What does a sus4 chord sound like?

Sus4 chords sound tense, anticipatory, and forward-leaning. They feel like a held breath before a resolution. The fourth pushes down toward the third, creating an expectation that the chord will resolve to major (or sometimes minor). This tension is gentle but unmistakable — sus4 chords have energy and direction that sus2 chords lack. The two perfect intervals (fourth and fifth) are only two semitones apart, creating a tight cluster at the top of the chord.

Where do you hear sus4 chords in music?

Pete Townshend built The Who's guitar sound around sus4 voicings — "Pinball Wizard" and "Won't Get Fooled Again" are built on sus4-to-major resolutions. Tom Petty's "Free Fallin'" uses Dsus4 to D major repeatedly. Hymns and worship music use sus4 chords extensively for their devotional, expectant quality. The Asus4-to-A and Dsus4-to-D patterns are among the first chord movements acoustic guitarists learn.

How to recognise sus4 chords by ear

Sus4 sounds like it is about to resolve — there is a palpable tension pushing downward. Compare it to sus2: sus4 pushes, sus2 floats. If a chord feels like it is waiting for something — leaning forward with an expectation of movement — that is the sus4 signature. The fourth and fifth, only two semitones apart, create a tight sound at the top of the chord that contrasts with the wider spacing in major, minor, and sus2.

Music theory deep dive

In classical counterpoint, the suspended fourth (4-3 suspension) is one of the most important ornamental devices. The fourth is prepared as a consonance, held over a changing bass (creating dissonance), then resolved downward to the third. This resolution pattern predates the concept of "sus4 chords" by centuries. In modern music, sus4 chords stand independently but still carry that residual pull toward resolution. The fact that the fourth is only one semitone above the major third makes the tension particularly audible.

Sus4 chords in ChordFrog

Sus4 chords are introduced at Level 4 (The Studio) in ChordFrog alongside sus2 and minor 7th. Learning to distinguish sus2 from sus4 is a key ear training challenge: both lack a third, but their characters are opposite. Sus4's tension and sus2's openness require different listening strategies — you must feel the push (sus4) vs the float (sus2).

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Frequently asked questions

What does "sus4" mean?

"Sus4" means "suspended fourth." The third is replaced (suspended) by the fourth, which sits 5 semitones above the root. Classically, the fourth resolves downward to the third; in modern music, sus4 often stands as an independent chord.

Does sus4 always resolve to major?

Traditionally yes — the fourth resolves down one semitone to the major third. But in modern music, sus4 can resolve to minor (fourth drops two semitones to the minor third), remain unresolved, or move to a completely different chord. Context determines the resolution.

Why does sus4 sound tense?

The perfect fourth sits just one semitone above where the major third would be, creating a pull downward. Additionally, the fourth and fifth are only two semitones apart — this close spacing creates a tight cluster that the ear perceives as tension seeking resolution.

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