Suggest me a book on how to focus in an environment full of distractions.

All productivity information I've read on this is about creating a proper environment to focus in.

Well i have a job with 2 or 3 hours of doing nothing, but im surrounded by people talking and music.

I'd like to be more capable of studying in that sort of situation.

It's not ideal, but it's better than nothing.

I do NOT want to create an environment without distractions. Just saying. Im not telling customers to shut up lmao