TheGraveDigger
Heavy Metal Maniac
Vader (death metal), Decapitated (death metal), and Behemoth (black metal) are the three bands I am most familair with out of Poland and they all rule.
Some other bands though I don't know much about them...
BLACK METAL
Abused Majesty
Baphomet's Throne
Belfegor
Black Altar
Damnation
Deception
Goetia
Hate
Hell Born
Lux Occulta
Sacrilegium
Strommoussheld
Tromsnar
DEATH METAL
Damnable
Delight
Devilyn
Dissenter
Esqarial
Eternal Deformity
Lost Soul
Mess Age
Mutilation
Nomad
Parricide
Pyorrhoea
Sceptic
Shadows Land
Sirrah
Throneum
Trauma
THRASH METAL
Destroyers
Hammer
Horrorscope
Totem
Some other bands though I don't know much about them...
BLACK METAL
Abused Majesty
Baphomet's Throne
Belfegor
Black Altar
Damnation
Deception
Goetia
Hate
Hell Born
Lux Occulta
Sacrilegium
Strommoussheld
Tromsnar
DEATH METAL
Damnable
Delight
Devilyn
Dissenter
Esqarial
Eternal Deformity
Lost Soul
Mess Age
Mutilation
Nomad
Parricide
Pyorrhoea
Sceptic
Shadows Land
Sirrah
Throneum
Trauma
THRASH METAL
Destroyers
Hammer
Horrorscope
Totem