SikTh

An influential Progressive Metal band from the UK who combined a very technical, mathcore inspired sound with a melodic and experimental side. They formed in 1999, split up in 2008, and reformed in 2012. They've released two acclaimed albums and two EPs. From 2001, their lineup remained constant.

In the last few years, the increased popularity of djent has seen them gain a lot of attention due to their undeniable influence on a lot of recent bands, as well as other progressive bands such as Protest the Hero, who have stated they are their biggest influence.

Members:

Mikee Goodman - Vocals
Justin Hill - Vocals
Dan Weller - Guitar
Graham "Pin" Pinney - Guitar
James Leach - Bass
Dan "Loord" Ford - Drums

Discography:

The Trees Are Dead & Dried Out Wait for Something Wild (2003)
Death of a Dead Day (2006)

SikTh provides examples of the following tropes:

The Band Minus the Face: Mikee and Justin both left the band. Unable to find new vocalists, they split up soon afterward.
Cover Version: Of Nick Cave's "Tupelo". Despite being about as far from technical metal as you can get, they hardly changed anything. And it works.
Epic Rocking: Mostly averted. Despite their highly experimental nature, they only have two songs over 7 minutes.
Large Ham: Several of Mikee's voices, especially the one he uses for the poems.
Lonely Piano Piece: Both parts of "Emersion".
Lyrical Dissonance: A lot of their songs are fast, furious metal with lyrics that are entirely surreal or just stupid.
Metalcore: Often get labeled as this, but it's mostly just the singing.
Metal Scream: Plenty of screaming all over the place, some of it downright psychotic.
Mohs Scale of Rock and Metal Hardness: Usually a solid 9, but they drop to about a 5 or 6 on softer songs.
Once Per Episode: A spoken word poem about the environment done in Mikee's strange, intimidating voice.
Progressive Metal
Signature Song: Probably "Bland Street Bloom", the first song from DoaDD. This shows off their technical side pretty perfectly.
Soprano and Gravel: Male example, Mikee's deranged screams to Justin's softer, more "emo-ish" singing. On the second album, each of them can play either role.
Surprisingly Gentle Song: They have a few more melodic songs, but each album has a distinct one: the poppy "Peep Show" from the first album, and the atmospheric "In This Light" from the second.
Subdued Section: They like this a lot. They'll often have a jazzy, experimental section in a song, such as "Scent of the Obscene".