What is the meaning of the round dance <Blue Danube>?

The full title of the piece is "Waltz by the beautiful blue Danube". The title is taken from the repetition of the last line of each stanza of a poem by the poet Karl Beck: "You are sentimental, you are young, beautiful, meek and good-natured, like gold shining in the mine, where the truth awakens, beside the Danube, beside the Danube, the beautiful blue Danube. Sweet-smelling flowers spit their fragrance, soothing the shadows and wounds of my heart The flowers in the barren bushes are still open, and the nightingale's song throats sing, By the Danube, by the beautiful blue Danube." The first minuet depicts the Danube as it is danced by people enraptured by nature. Theme A, with its lyrical and bright melody, its easy and lively rhythm, and the staccato that responds to the main theme, is full of cheerfulness and makes one feel that spring has come to the Danube; Theme B is lighthearted and bright, as if it were a praise of the Danube in spring. The second minuet first appears in D major, the first part of the melody jumps, ups and downs, layer by layer, the mood is bright and lively, giving people a feeling of vigor; suddenly the piece shifts to the key of B-flat major, which seems to be beautiful and euphemistic, contrasting with the first part. The clever and richly varied second ballad depicts the little girls in the Southern Alps, wearing goose down dresses in the joyful dance, richly varied colors seem particularly moving. The third minuet is a singing melody, with theme A characterized by grace and elegance, dignity and steadiness; theme B is characterized by fluidity, enhancing the dance, presenting a carnival dance scene. This piece of music adopts syncopated rhythm, which gives people a feeling of kindness and novelty. Theme A of the fourth minuet is beautiful and touching, rich in singing; theme B emphasizes the dance rhythm, with a warm and exuberant mood, contrasting with theme A. The rhythm is more free at the beginning, with the theme B having a flowing character, presenting an ecstatic dance scene. At the beginning of the rhythm is relatively free, arpeggio upward melody is so wonderful that even the composer himself is very pleased, as if the spring, refreshing. The Fifth Minuet is a continuation and development of the musical mood of the Fourth Minuet, only shifted to the key of A major. Theme A has an undulating and reverberating melody, soft and warm; theme B is a fiery and joyous piece of music that forms the climax of the piece. The undulating, wavy melody is reminiscent of a carefree boat ride on the Danube. Finally, there is the climax and conclusion of the piece. There are two types of endings to the piece. One is the choral ending, which follows the Fifth Sinfonia, and is very short, ending quickly and in a passionate atmosphere. The other is an orchestral finale, longer, reproducing in turn the themes of the Third Minuet, Fourth Minuet and First Minuet, followed by the main tones of the prelude to the piece, and ending in a blistering, carnival-like atmosphere.

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