This does happen all of the time to pretty much every song writer that ever had a hit.  Wiz Khalifa is being sued by a Pennsylvania rapper named Maximillion.  Maximillion has a track called "Pink and Yellow" that he put out in 2008.  Obviously the two names are similar, but it takes more than that to be actual theft doesn't it?  Wiz says he has no clue who the dude is and has never heard his song.  According to Wiz and his people are not open to a deal to settle with this guy.  Take a listen to both tracks and see what you think.

Maxamillion - "Pink and Yellow"

Wiz Khalifa - "Black and Yellow"