How do you classify music? Music is so complex that it seems impossible to categorize it but still there are so many genres. Here are a few common:- -Rock -Pop -Classical -Rap -Hip-hop Some classify based on the instrument used, some based on how you sing but I don't understand others. For e.g.:- What is the difference between alternative rock, electronic rock and rock? If you see Wikipedia, there are thousands of types. How? It's remarkable that so many classifications of music exist.