What's more, if the 'cookie' is entirely local (i.e. it's never sent back to your own server, e.g. you're using the local storage API and the javascript on your page never puts that information into a request), like how this would normally be implemented nowadays, then these requirements don't apply at all (because a cookie according to the law is just something your server gives to the user's device and then the device gives back later).

For me music helps me concentrate with some tasks (especially in a more noisy environment where there are more distracting sounds), distracts for others, and for some just makes it a little less boring. I don't really find that I want it for the sake of displacing my own thoughts, if I'm bored doing something it's because there aren't any particularly interesting thoughts involved (and full disclosure, I have ADHD so my mind doesn't really need any encouragement at all to wander).