The method of inserting six tones between the leading tone and the tonic tone is called Landini termination. In many works, the sixth tone is inserted between the seventh tone and the tonic of the upper voice scale, which is called Landini termination. Italy is the seat of the Christian Holy See and the center of Christian music. With the rise of Notre Dame music school in the 12th and 13th centuries, this center moved northward to the Frankish kingdom. After entering the 14th century, the struggle between ecclesiastical power and kingship led to the absurd situation that there were three popes in completely discredited. However, this situation promoted the great development of Italian secular music in the 14th century. Italian music in the 14th century is called trecento (meaning of Fourteen) music, and many of its works have elements of entertainment and leisure (such as emerging dance music). The important music genres are madrigal, caccia and ballata (from Italian ballare, meaning dancing). The most famous Italian composer in the 14th century francescoLandini (1325-1397), who was blind and showed great talent in music creation and performance. I have never written religious music works, but mainly wrote secular narrative songs. Many of Landini's works are closed by inserting a sixth note (ⅶ-ⅵ Ⅶ-Ⅵ-I) between the seventh note of the upper scale and the tonic note, which is called Landini termination.