
Gb Major scale – This is the ‘default scale’ of the Gb chord.Eb Major pentatonic scale – This scale will almost always work over the Gb Major chord, in any context.The most common and effective scales that can be used to solo/improvise over the Gb Major chord, or to create melodies for the purposes of song writing are:

Which Scales Can Be Played Over the Gb chord? The Gb chord can also be used itself as a substitute for more complicated chords, such as the Gb Major 7 chord, the Eb7 chord, and other extension chords which have Gb as the root note (it can’t be used in place of minor chords though!).

The Gb chord can often be substituted with the Gb sus 4 chord, the Gb sus 2 chord and the Gb add 9 chord.
