Do you remember the band "Men at Work"?  Well, they were sued for their song "Down Under" for stealing the "riff" of a song that was written nearly 40+ years earlier!  The sad part about the whole thing is that the lawsuit came 30 years later, and the person suing for the money is winning!

See the original article (or at least the one I found)...  the video is below if you're not interested in reading about it.