As for the chapters on classical music, the first thing to look at is what is the genre of the music?

Generally speaking, a symphony is composed of four movements. Each movement has no fixed title, but the tempo and form of each movement are basically fixed:

Second movement: Adagio, variations

Third movement: Allegro, scherzo; Divertimento, complex trilogy

Fourth movement: finale, allegro sonata form; rondo; complex trilogy; variations

Generally speaking, concertos and sonatas are composed of three movements:

First movement: Allegro, sonata form

Second movement: Adagio, variations; complex trilogy

Third movement: Finale, Allegro , Variations, Trilogy

It must be noted that sonata is a suite (multiple movements), and sonata form is the form of one movement. The two are completely different concepts.

Generally speaking, a suite has multiple movements. The number of movements is not fixed and is mainly determined according to what the composer wants to express

For example, Bizet's The Carmen Suite, Schumann's Childhood Scenes Suite, Saint-Sa?ns' Carnival of the Animals Suite, Mossorgsky's Pictures at an Exhibition Suite, etc. all have different numbers of movements.

In addition, there are some single-movement musical works, such as: waltz, gavotte, prelude, nocturne, etc. As far as the intro alone is concerned, it cannot be self-contained. It is just the beginning of a certain piece of music, usually very short. The finale is a self-contained movement in a suite. Therefore, the prelude and the finale are two completely different concepts.

I don’t know if you understand what I explain like this. If you still don’t understand, you are welcome to continue asking questions.