I had to make some though decisions on who and which style to include or not. Maybe I was too strict on 15 Names target that I gave myself.

But indeed you are right, I'm not so much into either Classical or Metal. In fact I don't know any artists Japanese in those 2 genres, maybe you could recommend us a few. And we could make a sequel to this guide with skipped styles... such as Jazz for which there are very good examples in Japan too