To learn G-Dragon - (Who You?, COUP DETAT, Korean Version) 니가 뭔데 chords, grasp the musical fabric of the song with this sequence - Ab, Bbm, Db, Ab, Db and Bbm of chords. To build a solid grasp, start slowly at 45 BPM and then match the original tempo of 90 BPM. Adjust the capo based on your vocal range and chord preference, keeping the song's key of Db Major in mind.