This is not news to you all, but is to me. I was somewhat startled to read this on page 8 in the Nov. 27, 1937 Magazine "Radio Guide":
"An idea of how much literary material exists about music may be gained when we check up on just one composer--Wagner. More books have been written about Christ, Napoleon, and Wagner than any other subject since history began." -Leonard Liebling
More than any other subject!
https://archive.org/details/radio-guide-1937-11-27/page/n9/mode/2up
But Google search told me that Barry Millington said this was a just a folk myth in "The Wagner Compendium: A Guide to Wagner’s Life and Music (1992)". Apparently he does not say how such an idea got started.
https://fivebooks.com/best-books/wagner/
Would be a cool statistic if true. But I would guess there are more books about solving crimes, regency romance, Star Trek, and maybe even J.R.R. Tolkien than the subject of Richard Wagner.
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