"How lighthearted I feel," said the father, "so pleased and cheerful."
“我感到非常高兴，”父亲说，“非常高兴和愉快。”
2
Not only because it's sung in a deep register, but also because it's a song about deeper or serious matters, certainly not lighthearted.
不仅因为这首歌唱得深沉，还因为这首歌是关于更深刻或更严肃的事情的，当然不是轻松的。
3
When the internal message is lighthearted and relatively unimportant, humor in a memorandum can distinguish its author as a person with personality and depth.