The Agonist (formerly The Tempest) is a metalcore band signed to Century Media Records. Hailing from Montreal, Canada, The Agonist comprises vocalist Alissa White-Gluz, guitarist Danny Marino, bassist Chris Kells, and drummer Simon McKay. They released their first album Once Only Imagined August 14, 2007. Released August 28, 2007, the video for "Business Suits and Combat Boots" was filmed by acclaimed director David Brodsky (Strapping Young Lad, Gwar, God Forbid).[1]. The video was voted the number 6 video of the year 2007 on MTV2's Headbanger's Ball.

The Agonist is known primarily for White-Gluz's ability to use both clean singing and death metal screams. Guitarist Danny Marino, nephew of guitar legend Frank Marino (of Frank Marino and Mahogany Rush), uses a melodic yet aggressive guitar style, making The Agonist's music both catchy and heavy. The Agonist can also be identified by their creative basslines by Chris Kells, and Simon McKay's intense and energetic drumming. Also known for their environmental consciousness, song's themes often revolve around moral concerns such as animal rights, societal dilemmas, and the state of our world. [2]

After releasing their first album (August 2007), The Agonist toured extensively, playing with bands such as God Forbid, Sonata Arctica, Overkill, Epica, Visions of Atlantis, and Enslaved. [3][4][5][6] They are currently writing their second album, due to be released in 2008.

Source : http://en.wikipedia.org/wiki/The_Agonist