What's a revelation about this? I recall taking out esoteric library books in college that had the vintage checkout cards in the back. Last checkout for the book was 20 years ago. There's a reason they have a music category called "Pop."
I tried to do a book report on The Three Musketeers in high school, only to discover the local library had discarded its only copy because no one had checked it out in years. (This was a few years before Amazon and Project Gutenburg, with no bookstore in town. Nowadays I own two different translations in print and have another on my phone.)
