Keltic Viking
I listened to a little Bol sagoth in the past, it's been awhile though, and thanks for introducing me to electric wizard, really diggin it, gonna have to go pick up their albums now
No problem. I started just listening to the songs on their myspace, but then found a lot of stuff on youtube. Of course, when I have money I will be purchasing their albums, mostly as a point of principle, but also because then I can rip them to my comp and mp3 players and have them everywhere. What I like is that they change their sound a lot from album to album, so you don't get bored with the same stuff over and over, but each one still has a similar feel...you'll get some stuff that's really heavy, and other stuff that's bluesy or even reminiscent of Hendrix. Their instrumental tracks, like Mother of Serpents and Ivixor B, I could just listen to on a loop for 15-20 mins.
@ everybody else
in defense of cookie monster vocals, from Amon Amarth or any other band, they grow on you. I wasn't a big fan when I first heard them, mainly because my favorite band at the time was the Misfits, which despite being some pretty ragged punk, had vocals which were inspired by Italian operatic singers, and even 50's doo-wop. But if you think that Amarth songs lack melody, I don't know what to say.
If you're not already a fan, definitely check out Twilight of the Thunder God first. A little more "mainstream" but straight up some killer songs. Also, read the lyrics while you listen. You'll appreciate them more because they're genuinely awesome, and you'll be able to follow along better.