Suspended chords replace the third, which removes the note that normally tells the ear whether the chord is major or minor. That creates an open, unresolved sound that often wants to move back to a regular major or minor chord.
Suspended chords are common in pop, rock, folk and worship music because one moving finger can add motion while the rest of the shape stays familiar.
Sus2 and sus4 name the replacement note
A sus2 uses the second scale degree instead of the third. A sus4 uses the fourth. For D chords, Dsus2 contains D, E and A, while Dsus4 contains D, G and A.
Why they sound unresolved
The chord has no third, so it is not clearly major or minor. The suspended note often resolves by moving to the third.
Not the same as add chords
An add2 or add9 chord keeps the third and adds another note. A sus chord replaces the third.
Suspension can be a movement, not just a chord label
In many songs a finger moves briefly from a major chord to a sus note and back. The musical effect comes from hearing that tension appear and resolve, not from treating the suspended shape as an isolated object.
Work through the shape
- Choose one familiar open major chord with sus variations.
- Play D major, Dsus2, D major, Dsus4 and D major in a slow sequence.
- Keep the common fingers in place and move only the note that changes.
- Listen to the moving note rather than only watching the shape.
When notes buzz or disappear
You call every chord with an extra finger “sus”
Check whether the third is removed. If the third remains, the chord is probably an add chord or extension.
The change sounds clumsy
Keep common fingers planted and move only the finger that changes the suspended note.
The chord still sounds major or minor
Check that the original third is not still sounding on another string. A true suspended voicing replaces the third rather than simply adding another note beside it.