Cao Cao's View of the Sea is an ancient poem, which expresses the poet's feelings for the sea and his thoughts on life. Therefore, the choice of background music should take into account the poet's emotional expression and the collocation of musical styles.

If you want to show the poet's awe and affection for the sea, you can choose some solemn, calm and affectionate music, such as orchestral music or classical guitar music. For example, you can choose Beethoven's Symphony of Destiny or Mozart's Requiem.

If you want to express the poet's thoughts on life and expectations for the future, you can choose some light and clear music, such as light music or folk music. For example, you can choose Bandari's Childhood Memories or 12 girl band's Squint Eyebrows and so on.

In short, the choice of background music should take into account the poet's emotional expression and the collocation of musical styles, so as to better show the artistic conception and emotion of poetry.