"the theme of which" is a correct and usable phrase in written English.
It is used to identify the theme of a larger entity, such as a book or a movie. For example, "The Catcher in the Rye is a book by J.D. Salinger, the theme of which is teenage angst and alienation."
Mangkusubroto announced the OGP competition for 2014, the theme of which will be citizen engagement.
On Monday night, her magazine won four James Beard awards, the theme of which was "Women in Food".
But neither could I feel the pleasure which I usually felt in philosophical discourse (for philosophy was the theme of which we spoke).
More than 14,000 attended this year's conference, the theme of which was "Let's Break Boundaries". A central focus of the conference was the job fair.
Cinderella, heroine of a European folktale, the theme of which appears in numerous stories worldwide; more than 500 versions of the story have been recorded in Europe alone.
This post is one in a series leading up to the 2017 Global Drucker Forum in Vienna, Austria — the theme of which is Growth and Inclusive Prosperity.
Radio regularly carries bhajans (devotional songs) and classical South Indian songs, the themes of which are often mythic.
They plan to find Scooter's long-missing father and return to him a rare signed edition of John Steinbeck's "Of Mice and Men," the themes of which (including friendship) play a substantial part in her novel.
Noah is quite a good movie, the themes of which are still and again in front of us.
BuzzFeed helpfully collected many of the awful tweets, the themes of which ranged from anti-Arab sentiment -- "So miss america is a terrorist" -- to anti-Indian racism -- "Miss America?
Exposure to these two minerals was the focus of a recent PhD thesis, the themes of which are illustrated in Table 1 (1– 4).
