Oh that's an old joke in forums.  Living Colour is the true BLACK metal band 
 
 
As for glam, well I may not like it, but I find a common base with metal more than to ordinary pop (Molester Jackson, Moronna, Beyondyech, Scooby Dog Snoopy, Shitney Smears, etc) . Meaning that if you pick Poison, Ratt, Motley Crue, Warrant, Guns N Roses, Stryper, Bullet Boys, etc and you have to compare with:
 
- Deep Purple, AC/DC, Led Zeppelin, Van Halen, Kiss, Nazareth
 
- Judas Priest, Black Sabbath, Motorhead, Iron Maiden, Scorpions, Thin Lizzy
 
- Obituary, Marduk, Reverend Bizarre, Holy Moses, CoB
 
- Pearl Jam, Nirvana, Soundgarden, Alice In Chains
 
- Slipknot, System Of A Down, Korn, Rage Against The Machine
 
Which one you think will be more akin?