Wow! This is an hard one! It's impossible to name just 10 bands... I'll list some of them in random order.
Borknagar (of course!) and all the "classics" from Norway: Emperor (my favourite) and all Ihsahn projects, Immortal, Burzum, Mayhem, Satyricon, Ulver, Enslaved, Arcturus, Windir (Hail...