What are some good hard core rock/ metal bands?
check out Dead Sara, Ramstein or Halestorm....all good
Slayer, Metallica, Slipknot, Anthrax, Accept.
Metallica, Iron Maiden....
Queen, Metallica, Guns n Roses, Iron Maiden, Slip Knot....
A very, very well respected band is Converge, hardcore punk/metal. Their most famous album is Jane Doe (2001). My favorite of theirs is Axe to Fall (2009).