To learn Back Number - Heroine chords, grasp the musical fabric of the song with this sequence - Bm, C, D, G, C, Em, C, G, D, Em and Bm of chords. Set your pace at 38 BPM initially and then sync up with the song's BPM of 76. To match your vocal range and chord inclination, adjust the capo in line with the key: G Major.