To learn Johnny Cash - Big River chords, grasp the musical fabric of the song with this sequence - Bb, F, Bb, F, C, G, C, Fm, F, Fm and G of chords. To master the tempo, it's wise to start at 46 BPM before aiming for the song's 92 BPM. Fine-tune the capo based on your vocal range, ensuring it complements the key of C Minor.