Dark Angel (3)

Thrash metal band which gained notoriety for its extremely fast and lengthy songs which included numerous tempo changes and progressive song structures.
The first song they released was "Welcome To The Slaughterhouse" on Metal Massacre VI, just before their debut.

Timeline:
1981 - Formed in Downey, California (United States) as Shellshock (5)
1992 - Disbanded
2002 - Reformed, however vocalist Ron Reinhart's health problems forced the band to disband permanently
2005 - Disbanded on indefinite hiatus
2013 - Reformed again in 2013 with the "Leave Scars" line-up.