these are the Bands that influenced Thrash Metal like Megadeth, Metallica, and Slayer, Anthrax
A II Z
Angel Witch
Blitzkrieg
Bronz
Budgie
Cloven Hoof
Def Leppard - yep they used to be the kings of this genre(listen to their first 2 albums youll be blown away how metal this band is), before they toned down to a mellodic metal that also influenced the Pop Metal genre such as Bon Jovi , Dokken, Warrant  etc.
Throughout 1979, the band won a loyal following among British hard rock/heavy metal fans, and were even initially considered the leaders of the New Wave of British Heavy Metal (eventually losing that spot to Iron Maiden). This emerging popularity resulted in a major label record deal with Phonogram/Vertigo (Mercury Records in the US).
Demon
Diamond Head
Dumpy's Rusty Nuts
E.F. Band
Elixir
Ethel the Frog
Girl
Girlschool
Grim Reaper
HellsBelles
Hollow Ground
Holocaust
Iron Maiden - Claim the title when def leppard choses another direction....
Jaguar
Legend
Lionheart
More
Motörhead
No Quarter
Persian Risk
Praying Mantis
Quartz
Raven
Rock Goddess
Samson
Saxon
Starfighters
Sweet Savage
Tank
Tokyo Blade
Tygers Of Pan Tang
Urchin
Vardis
Venom
White Spirit
Witchfinder General
Witchfynde
Xero
for more info about NWOBHM
http://en.wikipedia.org/wiki/New_Wav...sh_Heavy_Metal