Hehe, poor Oyo, hes still a baby when it comes to metal.
Death Metal- Morbid Angel
Melodic Death- In Flames
Black Metal- Emperor/Diabolical Masquerade
Avant Garde- Divina Enema
Prog Metal- Dream Theater
Power- Blind Guardian
Viking Metal- Falkenbach
Folk/Polka Metal- Finntroll
Dark Metal- Agalloch
And OF COURSE OPETH DOSN'T FIT A CATEGORY!!!!