To learn 梦然 - 少年 chords, grasp the musical fabric of the song with this sequence - C#m, A, E, B, C#m, E, A and B of chords. To master the tempo, it's wise to start at 44 BPM before aiming for the song's 90 BPM. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: E Major.