The term "initial theme" is correct and can be used in written English.
It refers to the main idea or topic that is introduced at the beginning of a sentence or paragraph. This term can be used in various types of writing, such as essays, reports, and articles. Example: The initial theme of the essay is the impact of technology on modern society.
Exact(15)
After the initial theme Ellington and Strayhorn move to blues tonality.
The title and initial theme of Xanadu were actually inspired by the film Citizen Kane.
Perhaps most important, the initial theme of a midlife crisis -- which Mr. Dreyfuss wanted because he said he identified with it -- is also being overhauled.
Tony took my initial theme concept (I'd been thinking we could collaborate on a weekday puzzle) and dreamed big with it.
Bombast erupts midway through, after which the initial theme resumes, warped with dissonances and crowned with a funereal trumpet solo (played eloquently here by Janis Porietis).
The subtitle, "Tansman Episodes," invokes the Polish-born twentieth-century composer Alexandre Tansman; the initial theme, heavy on the notes A, E, and E-flat, is derived from the letters of Tansman's name.
Similar(42)
Data coding and initial themes related to physiotherapy were initially compiled by the first author [J.L.].
Interviews were initially coded by the first author, with initial themes being developed into a coding framework.
It opens with a broad orchestral statement, bringing in the soloist after the initial themes are introduced.
As initial themes emerged, more specific codes emerged.
Following each FG, study staff debriefed to identify initial themes and impressions.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com