In no order:
Nightwish
Warmen
All That Remains
Disturbed
Killswitch Engage
Rammstein
In Flames
Deathstars
As I Lay Dying
The Letter Black
Evanescence
Brother Firetribe
Some older bands:
Judas Priest
Boston
Journey
Def Leppard
AC/DC
Motley Crue
Styx
Queen
Pink Floyd
Billy Idol
Foreigner
The ones bolded are my most favorites.