Suspensions and the Gospel Move
Soul music came out of gospel, and one harmonic gesture came with it more than any other: the suspension. A suspended fourth chord replaces the third with the fourth, which creates a mild tension, and then the fourth falls to the third and the chord becomes ordinary again. That fall is the whole effect.
On guitar it is usually one finger. Here is A suspended fourth, and then A major.
Asus4
A sus4. The note on the second string is a D, a fourth above the root.
A
A major. The second string drops one fret, D falls to C sharp, and the chord resolves. That one-fret move is the gospel sound.
The same thing on a D chord, where it is even easier — add your little finger, take it away again.
Dsus4
D sus4, with the extra finger on the first string.
D
D major. Lift the little finger and the suspension resolves.
What matters far more than the shapes is the timing, and this is where most people get it wrong. The suspension should land on the beat and resolve off it — the tension arrives where the listener expects the chord, and relaxes in the gap afterwards. Hitting the sus and the resolution both squarely on beats makes it sound like two separate chords rather than one gesture.
A reliable pattern: play the sus on beat one, resolve on the second half of beat two, then leave the rest of the bar alone. Try it on this A major groove, where A is the home chord.
City Groove | Robert Cray Style R&B Backing Track in A Major l BT 715
An R and B groove in A. Use the A sus4 to A move at the top of each phrase, and the D pair when the chord changes.