The phrase "a theme on which" is correct and usable in written English.
It can be used to introduce a topic or subject matter that serves as a basis for discussion or analysis.
Example: "The novel explores a theme on which many scholars have differing opinions."
Alternatives: "a topic on which" or "a subject on which".
(It's a theme on which she has expounded before).
The king gave Bach a theme on which to extemporise a three-voice fugue on the spot, which he did.
In general, most independent work in Art & Archaeology begins with the selection of an object or objects or a theme on which to focus.
The extreme parting of the legs made by Apollo's mother is also a theme on which all the muses make variations.
Cross-campus gathering will focus on the biggest challenges facing the world, and help determine a theme on which the university will focus in the 2019-2020 academic year.
Perhaps sensitive to this contrast, Mario Cuomo began our conversation by discoursing on the senselessness of political labels, a theme on which he has been riffing for 25 years.
"We learned that we can love everyone even if we don't like them," said Jonna Price, 11, of La Crescenta, adding: "I love doing the crafts". Each day, students study a particular Bible verse and observe a particular theme, on which their activities during the day are based.
You can build from this point to create a whole theme on which you will write, so it is a good idea to plan out the different aspects of the theme.
Having conducted Bach on a tour of his 15 pianofortes, that new-fangled instrument which Bach distrusted, Frederick presented him with a 21-note theme on which to improvise, a theme so devised - possibly, and if so treacherously, by Carl Bach - as to make contrapuntal variations well-nigh impossible.
Some years it is safari chic and desert neutrals, in others it is garden parties and florals – but come rain or shine, every fashion summer picks out a holiday-friendly theme on which to riff.
The "Solo di Viganò" movement had a Mozartean gracefulness, and the finale — with the theme on which the finale of Beethoven's "Eroica" Symphony is based — was given a muscular but fluid performance.
