Hmmm here are my 3:

Nightwish: Symphonic metal I guess (man I suck at genres)

Jimi Hendrix: Hard rock/blues rock

Alestorm: Pirate metal for the win^^

In my opinion screaming does take talent. Any one can scream, but learning to scream properly, from your diaphragm, so you dont completely ruin your voice, takes a lot of learning and skill.