1. lots of established law and case law (at least in the US), this is already a well-settled problem and folks have the tools and proper venue to bring infringement claims. Yes, federal copyright infringement litigation is prohibitively expensive for many issues. There is a now a "small claims court" for smaller issues. [1]
2. Those works cannot be copyrighted (at least in the US). [2]. And hey, someone already tried copyrighting every song melody [3]