I use Spotify, an application which, like many others, remains running when you close the window. That is to say, when I alt+F4, it doesn't have the desired effect. It only closes the window. The little icon at the bottom in the launch bar remains highlighted as an active application. You have to right click the icon and select "Quit" in order to truly close it. I don't feel like doing that every time.

Is there a keyboard shortcut equivalent to the ctrl+alt+del end task?