Hi GMC! In this lesson I will introduce to you to the concept of slash chords. This kind of chords are named this way because they have an altered bass that not always correspond to the sound of the chord.
Here is a list of the slash chords and the different scales that you can play over them:
C/C – C major & C lydian
Gb/C – C altered & C half-step/whole-step diminished
Db/C – C phrygian & C locrian
G/C – C major
D/C – C lydian
Ab/C – Ab major
Eb/C – C dorian
Bb/C – C mixolydian
E/C – C lydian augmented
B/C – C whole-step/half-step diminished
F/C – F major
The progression in this lesson is: Bb/C – C/D – D/C – D/B – D/Bb – Eb/D – *E7-11 F7 F#m7 – Dmaj7 – Dm7-b13.