D Suspended 4th (Dsus4)
1+4+5
Notes in D Suspended 4th
D (root)GA
Inversions
Same notes as D Suspended 4th, with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
D in the bass
1st inversion
G in the bass (Dsus4/G)
2nd inversion
A in the bass (Dsus4/A)
Press D, G and A together on the keyboard and you're playing D Suspended 4th.
The other suspension raises the missing third up to a perfect fourth, which sits a half step above where the third would normally be. That closeness creates real tension, and it's why a sus4 chord so often falls straight back down into the plain major or minor triad on the same root a beat later.