To learn David Jalbert - Si Dieu chords, your first step should be understanding these chords - E, D, F#m, E, A, E and F#m in sequence. I suggest starting at a calm pace of 62 BPM, and as you gain confidence, approach the song's BPM of 124. To match your vocal range and chord inclination, adjust the capo in line with the key: A Major.
