Amplifier are a 3 piece from Manchester U.K who I first heard in 2004 with their excellent self titled album. A follow on was released a couple of years later but proved to be the perennial 'difficult second album'. However they have recently released their third album The Octopus which is a sprawling double album that does over reach itself at times but is a definite grower and gets better with each play.
Kind of hard how to describe them. Maybe a less heavy and pretentious Tool who rely on atmosphere and not conventional riffs or typical bridge/chorus tracks.
Here they are:
From the debut album
From the new album:
More tunes on their website and a band well worth a little more investigation.
The official AMPLIFIER website.