To jam and learn Mattis - The Chain chords, your primary focus should be mastering these chords sequence: Gm, F, Eb, C, Gm, F, Bb and Eb. To master the tempo, it's wise to start at 58 BPM before aiming for the song's 116 BPM. Considering the song's key of C Minor, position your capo to suit your vocal and chord preferences.