Good metal groups

[Helm]

I'll give you stuff that will be easy to find:

Helloween - Walls of Jericho for good power metal

Omen - Battlecry, ditto

Hammers of Misfortune - The August Engine

now some death metal

Autopsy - Mental Funeral

Dusk - Morning Ressurect (also doomy)

and here's some progressive metal:

Heir Apparent - Graceful Inheritance

Psychotic Waltz - A Social Grace


nobody will be able to make fun of these choices (although I don't see why you'd care about that, but then again, you asked so I took it into account.) 'cause these are either pretty obscure, or proven classics.