F# Suspended 4th (F#sus4)
Also written as Gb Suspended 4th (Gb and F# are the same key).
1+4+5
Notes in F# Suspended 4th
F# (root)BC#
Inversions
Same notes as F# 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
F# in the bass
1st inversion
B in the bass
2nd inversion
C# in the bass
Press F#, B and C# together on the keyboard and you're playing F# 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.