Given the sheer amount of copyrighted music these days, I wonder whether some of the lack of whistle-ability and pure melody might be due to sheer number of mel

Given the sheer amount of copyrighted music these days, I wonder whether some of the lack of whistle-ability and pure melody might be due to sheer number of melody permutations already taken by previously written music. Given common chord progressions and music scales, it's probably likely that any catchy song your write bears some resemblance to an existing song with a protective copyright holder. There are many examples of lawsuits claiming retroactive ownership of new music.