If you can remember the history of metal, some of its roots are blues, some claim hard rock but what about classical? several metal musicians have inspiration on composers such as Bach, Wagner, Mozart, and Chopin to name a few, and there are even some similarities between classical and metal fans http://www.telegraph.co.uk/news/uknews/ ... raits.html
My question is this, how or why do you think such link exists? and how often do you observe it? are there any other subgenres (contemporary subgenres, music not older than one or two centuries) with heavier influence from classical?