Heavy Metal videos and hard music

I love listening to Heavy Metal, since it is the father of all styles of metal, and therefore the oldest. The bases are all now known and designated as metal, although we see many differences between the current styles and the first Heavy Metal. There have been numerous groups of Heavy Metal and it's really difficult to choose one, but Iron Maiden is definitely one of those bands that I can not ignore. It has always maintained that spirit that characterizes them.Another group is Judas Priest for their heavy metal style of a little more radical and extreme.Groups I am currently enjoying, both new and classic, to make the Heavy Metal still alive and very strong. Also, the Speed Metal is a style inherited directly from the traditional heavy, and retains many of the traits that define this, the father of all styles of metalheads. I can say in fact that is the evolution of Heavy Metal, Heavy Metal is the modern (despite having enough time.) But obviously much has evolved and innovated greatly.