Don't know if 'all' of these are still active but they're good ones I think.

Rammstein
Pantera
Bullet For My Valentine
Trivium
Evanescence
Within Temptation
Serj Tankian (System of a Down, lead singer)
Tenacious D
These are all examples of great bands. Tbh, I think the fans will keep this stuff alive. I LOVE metal and I never want to see it die!