What is the theme of the short song line?

The main purpose of the short song is to express the author Cao Cao's desire for talents and his willingness to appoint talents in order to realize his ambition of unifying the world. Short Song is one of the seven pieces of Yuefu Harmony. The theme is very clear, that is, the author Cao Cao is thirsty for talents and hopes that all talents will come to take refuge in himself. In his political activities, in order to expand his ruling base among civilian landlords and crack down on reactionary hereditary forces, Cao Cao once strongly emphasized that "meritocracy means promotion", and for this reason, he successively issued orders to seek talents, promote scholars and escape. "A Short Song" is actually a "song of seeking the virtuous", and it is precisely because it uses the form of poetry and contains rich lyric elements that it can play a unique infectious role, effectively publicize his persistence and cooperate with his decrees. In addition, Short Song also integrates lyricism, scenery description, narration and reasoning, runs through the sad mood with pure and simple language, and expresses the generous mood with powerful rhyme and undulating tone, with profound and beautiful mood, rich style and sincere feelings.