bands like Iron Maiden and Holy grail, they aren't considered power metal, yet they sound like it. and please forgive my metal ignorance, but i can't be the only one who cant tell the difference well between metal sub-genres.
I'd like to say firstly: AC/DC, KISS and Led Zeppelin aren't metal, hard rock/ rock. Metal is the genre. Then there are the subgenres that are classified under metal for example: Turisas, Equilibrium, Korpiklaani, Eluvietie, Finntroll, and Ensiferum are all folk-metal Devildriver, Wintersun, Insomnium, and Children of Bodom are Melodic death metal. those are just a few band examples of sub genres. other genres include, death, viking, power, black, speed, sludge, doom, and progressive. Now a lot of bands that come out now are either Deathcore or metalcore. Basically its the roots of hardcore punk (the infamous screaming and fast playing) with death metal (deatchore) or metal (metalcore) influences. It's not true metal, but it has a metal sound. Bands like Suicide Silence, The Black Dahlia Murder (though they have some melo death influence), With Blood Comes Cleansing, Suffokate, etc etc are deathcore. Bands like As I Lay Dying for an example is metalcore. I hope this helped a little :)
Yes those bands were all called Metal back in the day - metal has evolved in various directions since which confuses a lot of modern metal fans when they hear this stuff. Surely that's Classic Rock they shout before rushing to type in questions demanding seperate Y/A sections for each individual metal subgenre. Same thing has happened to punk and goth.
Metallica Slayer Pantera Exodus Venom Testament Those are real Metal bands bfmv my chemical romance a7x FALSE POSER METAL a.k.a Crap
The definition of metal has evolved over time. There's a billion different sub-genres of what we consider metal so it's a lot easier to say something is heavy metal than trying to come up with a new name or using some pointless obscure term.