To jam and learn 四优 - 夜半 chords, your primary focus should be mastering these chords sequence: B, E, F#m, B, E, G#m, A, B, C#m, G#m, A and E. For a smooth transition, initiate your practice at 30 BPM and gradually match the song's pace of 62 BPM. Set the capo considering your vocal range and favored chords, aligned with the key: E Major.