Passacaglia variations to express what

Variation is "a partial change in the form or texture of the musical material", which is the definition of variation given by Prof. Zhao Xiaosheng in his book Traditional Composition Techniques: no change at all is repetition, and a complete change is new material. Variation is to be different from the original material, but also to be related to it.

It is a basic principle of variation based on the principle of variation of a subject material itself, i.e., "to be different from the original material, and to be more related to it".

Pasacaglia (Pasacaglia) is a kind of three-beat slow dance music, most of them are written in a low minor key, based on 4 to 8 bars of fixed bass as a basis for a short song, to be around the theme and continuous variation.

The passacaglia has this characteristic because it is a folk dance that originated in Spain at the end of the 16th century, and because of the initial contribution of the guitar to the music, the passacaglia retains this bass variation, and thus develops into a variation with a sectional structure that varies over a fixed bass melody.

Adding some embellishments to the original melody or distorting around it gives the piece a richer expression. It sounds and plays more varied, which is conducive to a better expression of the feelings of the piece. There are many forms and methods of variation, and a section of the same melody can be transformed into many forms of variation through different methods.