F# Augmented (F#aug)
Also written as Gb Augmented (Gb and F# are the same key).
1+3+#5
Notes in F# Augmented
F# (root)A#D
Inversions
Same notes as F# Augmented, 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
A# in the bass (F#aug/A#)
2nd inversion
D in the bass (F#aug/D)
F# Augmented is built from F#, A# and D.
Stretch the fifth of a major chord up by a semitone and the result is symmetrical: two identical major thirds stacked on top of each other. That symmetry means the chord has no clear sense of up or down, giving it a floating, slightly dizzying quality composers reach for when a moment needs to feel suspended or unresolved.