Let's start jamming Unchain - Robinson chords, Practice these chords sequence - G#, C#m, F#m, Bm, C#m, D, C#m, Bm, D, D# and G#. To build a solid grasp, start slowly at 58 BPM and then match the original tempo of 116 BPM. To match your vocal range and chord inclination, adjust the capo in line with the key: A Major.
