some death/black bands
Luciferion
Belphegor
Behemoth
Zyklon
Lock Up (in a way)
the black metal universe is so extense... you got from Burzum to Gaahiskagg ... there are so many variations and evolutions of Black metal, see Emperor, Gorgoroth, Ulver, etc.
Opeth started with a great influence of black metal, mainly from Bathory (mikael is a great fan), Immortal (diabolical fullmoon mysticism, if you don't have listened, do it is a great album with acoustic parts and changes, some ambiental keyboards, similar to bathory), celtic Frost (the beginning of BM), etc.
Mikael always dreamed to play in a BM band (until now i think...)
just hear the guitar distortion on Orchid and Morningrise, the lyrics (nature, even some pagan lyrics, signature from the nature pagan BM).
the most BM songs of Opeth... maybe are:
Forest of October (a great BM piece) my favourite song of Opeth!!!
Under the Weeping Moon
In Mist She Was Standing
Black Rose Immortal (too BM )
The Night and Silent Water
Advent
April Ethereal / When (less BM than others, but with the essence)
i got to go.
bye!!!