The Beats 1 Radio will be free for the foreseeable future, but if you signed up for Apple's music streaming service, you'll end up getting charged for it and, obviously, Apple already has your credit card details. Remember? When you set up your iTunes account, you put your details in there? So even if you're not using it, or don't like it, you could end up seeing charges on your bank account.
So what happens if you don't want to pay for it?
Well, you can disable auto-renewal of your Apple Music subscription, so you don't get any nasty surprises. If you're on your iPhone, iPad, or iPod touch, here is what you have to do.
Open up the Music app, and then hit the icon that looks like a person, in the top-left of the screen. Sign-in and all that. Then, hit View Apple ID (you might have to put your password in again) and then, under the Subscriptions bit, press the Manage button. There, you'll see a thing that says Renew Options. In there, you'll be able to switch Automatic Renewal to off.