I wouldn't really say I enjoy artists or genres so much as I do specific songs...
That said, I'm a fan of quite a lot of Power Metal (primarily Symphonic)
So that'd be Nightwish, Sonata Arctica, Alestorm, Gloryhammer, and a few others.
I also enjoy trailer music (the kinds of songs you hear in movies) e.g Two Steps From Hell, Audiomachine, Brunuhville
A few electronic things, such as Aviators, Machinimasound, Atpunk
And finally some 'classics' that've sprouted up over the years - most of which are in the 90's, but a few 80's and 2000's as well.
I'll listen to pretty much anything, even rap if it's done well (although it's usually only "done well" if it's part of a mashup, hehe).