The Gb/Bb chord is a Gb Major chord, with the Bb (the 3rd) as the bass note.
The chord is also referred to as Gb over Bb, or Gb ‘slash’ Bb, or simply, G flat with a B flat in the bass.
Technically, the Gb Major chord with the Bb in the bass is a first inversion G flat Major chord.
Some Gb/Bb Chord Theory and Info
- The Gb/Bb chord contains the notes Bb, Gb and Db.
- It is a G flat Major chord with a B flat in the bass.
- The root note of Gb/Bb is Gb, the bass note is Gb.