Two different main sections (A B). Commonly in Western classical music, the A section will move away from the tonic, with a strong cadence in another key, and the B section will move back and end strongly in the tonic.
Pieces in binary form have two parts: A and B.
Pieces in ternary form have three parts: A - B - A.
Sections A and B can be more contrasting than in binary form.
One section returns repeatedly, with a section of new music before each return. (A B A C A ; sometimes A B A C A B A)
In the rondo form, section A is repeated several times with new sections presented between each repetition. Follows the basic form:
We can add more sections as in the following example:
Section A can be repeated with variations. Composers generally try to achieve some contrast between section and the use of differet keys for different sections is very common.
Composed of verses. The music is repeated sections with fairly small changes. May or may not include a refrain.
The opposite of strophic form, with new music written for every stanza, is called through-composed.
Example of Strophic Form created by nine different animators over the course of a year, each tackling 32 seconds (8 bars) of a song before passing it on for the next artist to continue the story, Lucinate’s title track Big Noise is an awesome collaboration. It’s noir in your eyes and dreamy jazz in your ears.
Source: https://vimeo.com/258406948
The most popular arch-form structure is ABCBA.
In music, arch form is a sectional structure for a piece of music based on repetition, in reverse order, of all or most musical sections such that the overall form is symmetric, most often around a central movement. The sections need not be repeated verbatim but must at least share thematic material.