What are the poems that describe sadness?

Li Bai's "Looking at the Lushan Waterfall":

The incense burner produces purple smoke in the sunshine,

Looking at the waterfall hanging in front of the river in the distance.

The flying current flows down three thousand feet,

It is suspected that the Milky Way has fallen into the sky.

Li Bai's "Gift to Wang Lun":

Li Bai was about to leave in a boat,

suddenly he heard singing on the shore.

The water in Peach Blossom Pond is a thousand feet deep,

It is not as good as Wang Lun’s gift to me.

Li Bai's "Yellow Crane Tower Sends Meng Haoran to Guangling":

The old friend bid farewell to the Yellow Crane Tower in the west,

Fireworks descended from Yangzhou in March.

The shadow of the solitary sail is gone in the blue sky.

Only the Yangtze River can be seen flowing in the sky.