Well, another question and another topic I knew nothing about! A patron came in asking for a book about 'audio engineering'. When I asked about it for a bit more information, he said it was about the music-creating process, which can including mixing music.
While my husband is a musician, he'd never mentioned audio engineering to me.
So I looked it up on Google for a bit more information, and when I found a few more keywords, I was able to put a few books up in our catalog for my patron.
When he came out of the stacks, he had a couple of books in hand.