To start learning 梦然 - 何必 chords, delve into these chords sequence to get the song's feel: Cm, F, Bb, F, Gm and F. To master the tempo, it's wise to start at 60 BPM before aiming for the song's 120 BPM. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: Bb Major.