Not all chords are built by stacking thirds. Suspended chords replace the 3rd with a neighboring note, power chords strip away the 3rd entirely, and add chords layer extra notes on top of a complete triad. These chords expand your harmonic palette beyond the major/minor binary, giving you tools for ambiguity, tension, color, and raw power.
The 3rd of a chord is what determines whether it sounds major (bright) or minor (dark). When you remove or replace the 3rd, you take away that fundamental distinction. The result is a chord that exists in a kind of harmonic limbo -- neither happy nor sad, but something else entirely. This "something else" is exactly what makes these chords so useful in modern music.
Root Note
Replace the 3rd with a 2nd or 4th, removing the major/minor quality entirely.
Just root and 5th. No 3rd means no major or minor quality at all.
A triad with an extra upper note added -- keeps the 3rd, unlike sus chords.
The sus2 chord replaces the 3rd of a triad with the 2nd (a major 2nd, 2 semitones above the root). Without a 3rd, the chord is neither major nor minor -- it sits in an ambiguous, open space. The closeness of the 2nd to the root creates a shimmering quality. Sus2 chords are very common in modern rock, pop, and ambient music because they sound fresh and unresolved without being dissonant.
Csus2
Notes: C -- D -- G
Root + Major 2nd (2) + Perfect 5th (7)
Where you hear it
Power chords are deceptively simple -- just root and 5th -- but they are the backbone of rock, punk, and metal. The reason they work so well with distortion is physics: the perfect 5th has a simple frequency ratio of 3:2, which stays consonant even under heavy gain. Adding a 3rd introduces a more complex ratio that creates harsh "intermodulation distortion" (beating between frequencies) when amplified.
Standard Power Chord
Root + 5th (e.g., C + G)
Notation: C5
Octave-Doubled Power Chord
Root + 5th + Octave (e.g., C + G + C)
The most common voicing on guitar
Why No 3rd?
Without a 3rd, power chords are harmonically ambiguous -- neither major nor minor. This ambiguity is a feature, not a bug. It lets the melody or vocal determine the emotional quality while the rhythm guitar provides pure energy and weight. It also means one chord shape works for both major and minor contexts.
It is important to understand the difference between add chords and extended chords. An add9 chord is a triad plus the 9th -- it skips the 7th. A "9th chord" (like C9) includes the 7th. The add chord is simpler and more transparent; the extended chord is richer and jazzier.
C, E, G, D (no 7th)
A simple major triad with the 9th added for color. Clean, transparent sound. Very common in acoustic guitar music.
C, E, G, Bb, D (includes 7th)
A dominant 7th chord with the 9th stacked on top. Full, jazzy, complex sound. Common in jazz and funk.
| Type | Formula | Intervals | Character | Key Feature |
|---|---|---|---|---|
| Sus2 | R -- 2 -- 5 | [0, 2, 7] | Open, airy | Replaces 3rd with 2nd |
| Sus4 | R -- 4 -- 5 | [0, 5, 7] | Tense, expectant | Replaces 3rd with 4th |
| Power (5) | R -- 5 | [0, 7] | Strong, neutral | No 3rd at all |
| Add9 | R -- 3 -- 5 -- 9 | [0, 4, 7, 14] | Shimmering | Triad + 9th (no 7th) |
| Add11 | R -- 3 -- 5 -- 11 | [0, 4, 7, 17] | Dreamy | Triad + 11th (no 7th) |
Remember: Suspended chords replace the 3rd. Add chords keep the 3rd and add extra notes. Power chords remove the 3rd entirely. This distinction is fundamental to understanding how these chords function differently in music.