Why do they always play classical music in book stores?

Disclaimer; I have nothing against classical music, in fact, I enjoy it myself.
I also do not criticize book stores in any way.
And third, I am aware that not all book stores play classical music.

However, it is fairly common that this type of music will be played in book stores, at least the ones where new books are sold, as opposed to used book stores.

I once read that in places like malls and grocery stores, they often play music to calm customers down, as apparently, shopping is some stressful business. Seems legit.

But what is it with book stores and classical music in particular? Why that type of music and not another? What do they associate classical music with? Literature? Intellect? What’s the deal here?