A suspended chord replaces the third with either the 2nd or the 4th. No third means no major or minor quality - the chord hangs in between, unresolved.
If the third is the ingredient that gives a chord its flavour, taking it out creates something deliberately neutral. Like a dish without seasoning - it builds anticipation for what comes next.
Sus4
The third is replaced by the 4th (5 semitones from root). This is the more common type. It sounds tense and wants to resolve down to a major chord.
Csus4 - C, F, G
Sus2
The third is replaced by the 2nd (2 semitones from root). Sounds more open and airy than sus4. Common in ambient and indie music.
Csus2 - C, D, G
Major vs Sus4 vs Sus2
All three share the root and fifth. Only the middle note changes. Tap each to hear how removing the third changes the character.
Sus4 to major: hear the tension resolve.
How suspended chords are used
Sus chords create tension that resolves when the suspended note moves to the third. The classic move is: sus4 -> major. You hear it everywhere - from hymns to EDM builds.
They're also used on their own for an ambiguous sound. Without a third, the chord doesn't commit to major or minor - useful when you want something open and undefined.
Key takeaway
Sus chords replace the 3rd with the 2nd (sus2) or 4th (sus4). No third = no major/minor identity. They create tension that resolves when the 3rd returns.
With triads, sevenths, extensions, and sus chords covered, you have the full chord toolkit. Next: putting chords in sequence - progressions.
More suspended chords
Tap to hear sus chords on different roots.
Add suspended chords to your tracks
Starts includes sus2 and sus4 chord types in its generator.