Please give me more information about this music

Well...

For all underground metal be it; death metal, black metal, gore metal,
grind, death grind, grind core, speed metal, thrash metal etc. you
should visit http://www.darksoul7.com
Darksoul VII North American Metal Underground covers both unsigned and
signed metal bands in North America as well as provides underground
metal news, cd reviews, interviews, and they have a forum with very
knowledgable metalheads.

For underground metal from Scandinavia I strongly suggest
http://www.swedishmetal.net for all the same reasons as
http://www.darksoul7.com

For underground metal from Ireland I suggest http://www.metalireland.com

And if you want to listen to some great underground metal of all
varieties listen to Extreme Metal Halifax here:
http://is2.dal.ca/%7Eckdufm/ckdu_hi.pls

Happy Hunting \m/

I almost forgot...

darksoul7.com also has free mp3s to download if you want to sample
different types of underground metal or extreme metal .

For metal history visit http://metal-archives.com they have tons of info too.