To learn Deep Purple - Fireball chords, grasp the musical fabric of the song with this sequence - B, Bm, A, E, B, A, B and A of chords. Begin your practice at a relaxed 60 BPM, then work your way up to the song's BPM of 121. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: E Minor.