How to handle notifications in unfocused window?

I'm having a radio website and whenever a new song comes up, it shows a notification and most of the time you don't have the window focused, so what to do if the user decides to click them?

• Hide Notification
• Hide Notification and focus window

Note that it is very hard to hit the "X" on the corner of the notification, so hiding it seems to be the best choice when the user wants it gone quickly.