Watch the Alternate Bass Lines Pt. 3 online guitar lesson by Brad Carlton from Guitar Lab: The Imaj7 IVm6 Progression
In this variation, we'll substitute a Gm7(9) for the Bbmaj7 that we've been using previously. This simply means that instead of being in Bb Ionian, you'll be in G Aeolian. Know your scale degrees so you that you'll be able to target strong chord tones.