From Wikipedia:
Rest are an instrumental rock group from Cork, Ireland consisting of members Graham Lynch, Steve Barry, Colm O'Shea, and Johnny Lynch. The group's sound has evolved over the course of their existence to incorporate elements of progressive rock, tech-metal, post-rock, doom, black metal and math rock. The groups sound is characterised by intricate harmonised riffs, complex drum patterns, unconventional song structures, a heavy emphasis on dynamics and alternating time signatures.
