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Different key, changed lyrics, changed melodies, it is a finicky field. You want it recognizable but not close enough to the original ;  ). 

There is one other cover in there, particularly one for house of the rising sun, where copyright has faded with time. 

Also there are laws concerning parody music and satire which complicates things, its not exactly clearcut, and you know, this is clearly a parody of u drive me crazy by waldos people a song whhich may or may not  have been inspired by a certain riff. In case you are curious there are also copyright stuff you can run things through when it comes to audio, youtube probably being the most used one these days. If I ever get a real complaint, I would probably get the mechanical license, which is a whole lot different from a normal one.