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Strophic form, or chorus form, is a sectional
and/or additive way of structuring a piece of music based on the repetition of one formal
section or block played repeatedly.
It may be considered AAA... or AA'A"....
The most folk and popular songs are strophic in form, including the twelve bar blues. Thus the "verse-chorus-verse" of most popular music songs is a strophic verse-refrain
form. The chorus often sharply constrasts the verse melodically, rhythmically, and harmonically, and assumes a higher level of dynamics and activity,
often with added instrumentation.
A very similar form is theme and variations form. In
this form, there is a musical melody (the theme), followed by many altered versions of it (the variations). The variations are
all altered forms of the theme; the theme is always present in each of the variations. The theme is either original or previously
written by another composer
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