To learn Exo - Trouble chords, grasp the musical fabric of the song with this sequence - Dm, Em, Dm, Em, F, Dm, A, G, C, Em and A of chords. Kick off your practice at a gentle 76 BPM, then escalate to the song's tempo of 152 BPM. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: C Major.