Waltz originated from a folk three-beat dance in northern Austria. There are two kinds of waltzes: fast waltzes and slow waltzes. When dancing, two people spin in pairs. 17 and 18 centuries became popular in the court of Vienna, and the speed became faster and faster. They were first used for social dancing in cities. It has been popular in European countries since19th century. The most popular waltzes at present are Viennese waltzes, the speed is Allegro, which is characterized by festive and lively, smooth melody; In accompaniment, each bar often uses a chord, and the stress in the first beat is more prominent. The famous waltzes are johann strauss's Blue River and Weber's Invitation to Dance. Waltz is a foreign music genre for our country, and English is the reason why it is sometimes transliterated as "waltz", which generally originated in rural areas. Waltz was developed in cities, especially Vienna, with the development of society. Therefore, some waltzes are also called Viennese waltzes. Tracing back to the source, the predecessor of Waltz is Austrian folk "Landero Dance", which is also a country dance music. Waltz is a three-beat dance developed on the basis of "Landero Dance". When dancing, pairs of men and women rotate in circles with the rhythm of the dance, with light and graceful movements and warm and cheerful emotions. These characteristics determine the genre characteristics of waltz: faster speed, beat or beat, and these characteristics, together with the tone rotating around the fulcrum sound, vividly produce a sense of rotation and hovering. The genre characteristics of waltz are more obviously reflected in its accompaniment sound form. A typical waltz accompaniment consists of three even-numbered quarter notes with distinct strengths and weaknesses (in the beat, it is an eighth note), one chord in each bar, and the first beat is a strong beat, which is used to play the bass of the chord. The second and third beats are weak beats, and other chords are played in higher notes.