Sus chords stand for “suspended” chords, and they do exactly what the name suggests: they suspend the normal third of a chord, replacing it with either a second or a fourth. This creates an open, unresolved quality that feels like the chord is floating or waiting for something to happen.
There are two main sus chords: sus2 and sus4. A sus2 chord replaces the third with a second (2 semitones from the root). A sus4 chord replaces the third with a fourth (5 semitones from the root). Both contain the perfect fifth (7 semitones from the root), which anchors the chord, but the absence of a major or minor third gives sus chords their distinctive floating quality.
Sus chords are incredibly useful in modern music because they solve a common problem: they let you build movement and tension without committing to major or minor. A sus chord can move to a major chord (adding the major third) or a minor chord (adding the minor third), creating a sense of resolution. This makes sus chords perfect for creating anticipation and forward motion in progressions.
Sus2 Chord Formula
The sus2 formula is: root plus a major second (2 semitones) plus a perfect fifth (7 semitones). That’s it. Two intervals, three notes total (if you count the root once).
Let’s build a Csus2. Start with C, go up 2 semitones to D (the major second), and up 7 semitones total to G (the perfect fifth). That gives you C, D, G. No third note at all — the major second replaces where the major or minor third would normally sit.
Sus2 chords have an open, spacious quality. They sound almost like a slash chord or powerless harmony — there’s no major or minor character pulling in either direction. If you play Csus2 followed by Cmaj, it sounds like the suspended second “resolves” up to the third. If you follow it with Cmin, it sounds like it resolves down. But Csus2 on its own is neutral and unresolved.
The major second interval (2 semitones) is small and close to the root, creating an intimate, open quality. When building major chords you start with that major third (4 semitones). A sus2 goes only halfway there, creating something that feels incomplete but stable enough to sit alone.
Sus4 Chord Formula
The sus4 formula is: root plus a perfect fourth (5 semitones) plus a perfect fifth (7 semitones). This replaces the third with a fourth — a larger interval than sus2, but still not a full major or minor third.
Let’s build a Csus4. Start with C, go up 5 semitones to F (the perfect fourth), and up 7 semitones total to G (the perfect fifth). You get C, F, G. Again, no third — the perfect fourth replaces it.
Sus4 chords have a more open, classical feel than sus2 chords. They’re often used in folk and classical music, creating an almost hymn-like quality. Sus4 chords feel “hanging” — like something is waiting to happen. If you resolve a sus4 to a major or minor chord, the fourth moves to the third, creating a smooth voice-leading movement.
The perfect fourth (5 semitones) is a larger interval than the major second, so sus4 chords have a more spacious, ringing quality. When playing guitar chord construction, you’ll find sus4 chords very natural because the fourth and fifth sit nicely on adjacent strings.
Sus2 vs. Sus4: Understanding the Difference
Sus2 and sus4 are both “suspended” chords, but they have different characteristics. Sus2 is smaller and closer to the root, creating an intimate, open quality. Sus4 is larger and more spread out, creating a more classical, hanging feeling.
A Csus2 (C, D, G) feels brighter and more contemporary. A Csus4 (C, F, G) feels more classical and traditional. Both lack the major or minor third, but they have different emotional characters because of their different intervals.
When you resolve a sus chord to major or minor, the suspended note moves to the third. In a sus2 to major resolution, the second moves up one fret to the major third. In a sus4 to major resolution, the fourth moves down one fret to the major third. Both create smooth, natural voice leading.
Using chord symbols to notate sus chords is straightforward. “Sus2” or “sus4” after a chord root tells you exactly what you’re playing. Csus2, Fsus4, Gsus2 — the notation is unambiguous.
Building Sus Chords on Guitar
Sus2 chords on guitar have a characteristic shape. You’re playing the root, the second (2 frets up), and the fifth (7 frets from the root). A basic Csus2 uses C on the third fret of the A string, D on the second fret of the G string, and G on the open high E string. Alternatively, you can play open position shapes that use open strings to create that suspended character.
Sus4 chords follow a similar pattern. Root, fourth (5 frets up), and fifth (7 frets from the root). A basic Csus4 uses C on the third fret of the A string, F on the third fret of the D string, and G on the open high E string. Many sus4 shapes are very natural on guitar because of how the fourth and fifth stack on adjacent strings.
Both sus2 and sus4 have moveable barre chord versions. Once you learn the basic shape, you can shift it across the fretboard to play sus chords in any key. Understanding guitar chord construction through interval distances (2+7 for sus2, 5+7 for sus4) makes these shapes portable.
Sus Chords in Chord Progressions
Sus chords are extremely effective for creating movement in progressions. A simple I-IV progression (C major to F major) becomes more interesting with sus chords: Csus4 to F major, or C major to Fsus4. That brief suspended moment adds tension and anticipation.
In pop music, sus chords are often used for their contemporary feel. A progression might use sus4 or sus2 chords to create modern, slightly unresolved character. The listener hears the suspension and either consciously or subconsciously expects resolution.
In classical and folk contexts, sus4 chords are used for their traditional, hymn-like quality. Many folk melodies and classical pieces use sus4 chords to create that floating, unresolved feeling that’s characteristic of certain musical styles.
The movement from sus to major (or minor) creates one of the most satisfying progressions in music. Csus4 to Cmaj, Dsus2 to Dmaj — that resolution feels natural and complete. This is why sus chords are so useful in songwriting and composition.
Sus Chord Examples and Applications
Here are sus chords in different keys:
Csus2: C, D, G
Csus4: C, F, G
Gsus2: G, A, D
Gsus4: G, C, D
Dsus2: D, E, A
Dsus4: D, G, A
Fsus2: F, G, C
Fsus4: F, Bb, C
Each sus2 chord has that intimate, open quality. Each sus4 has that more classical, hanging feeling. The interval relationships determine the character, making sus chords instantly recognizable once you know what to listen for.
Sus chords are also useful because they’re neutral. When you don’t know yet whether a progression should go major or minor, sus chords give you time to decide. Use that ambiguity for effect — the listener hears the suspended moment and waits for resolution.
Frequently Asked Questions
Can I have a sus chord with both a second and a fourth?
Technically, yes — chords like Cadd2add4 exist in music theory. But these are quite rare and complex. Standard sus chords use either sus2 OR sus4, not both, to maintain that clean, suspended quality.
Does the sus chord always resolve to major or minor?
No, a sus chord can stand alone or move to another sus chord or any other harmony. While sus-to-major or sus-to-minor resolutions are common and satisfying, sus chords are equally useful staying put or moving to entirely different chords.
What’s the difference between sus2 and add2?
A sus2 replaces the third (so the third is not in the chord). An add2 adds the second while keeping the third. Cadd2 = C, E, D (has the third). Csus2 = C, D, G (no third). They’re different chords with different sounds.
How do I remember the sus4 formula?
Think “root, up 5, up 7.” The fourth is 5 semitones from the root, and the fifth is 7 semitones from the root. On the same string, that’s 5 frets to the fourth and 7 frets to the fifth.
Are sus chords used in jazz?
Not extensively in traditional jazz, where the music tends to use full seventh chords and extended harmonies. However, contemporary jazz and fusion sometimes use sus chords for modern effects. Understanding guitar chord theory shows sus chords belong more to classical, folk, pop, and rock contexts.
Can a sus4 become a sus2?
Not directly — they’re two different suspensions. However, a sus4 can resolve to a sus2 through voice leading. A Csus4 might resolve to a Csus2 by moving certain notes, creating an unusual progression that emphasizes the suspended character.
What makes sus chords feel “unresolved”?
The absence of a major or minor third. Major and minor thirds define whether a chord sounds major or minor. Without that third, the chord is harmonically neutral, which our ears perceive as “waiting” for that defining interval.