tuneskip?

Is there a word for when, for some inexplicable reason, a song gets stuck in your head that you have not heard anywhere recently and for which you do not have any particular fondness? Is there a separate word for when this occurs and only a small segment of the lyrics loop through your mind endlessly? Is there yet another word for the special kind of hell it is to experience both of these things to the tune of Toto's "Africa?"