Mohs Scale of Rock and Metal Hardness is a sorting algorithm of, well, musical hardness; however, due to Lyrical Dissonance, mere musical sound is not always enough to determine the actual hardness of a song. This trope ranks songs (and to a lesser extent, albums, artists and bands in general) by the hardness/darkness/heaviness of their lyrics. The name has a certain punny quality to it. After all, this is Mohs' Scale of Lyrical Hardness. Get it? Because of the musical scale? Ahem.