Jeff Killed John was the forerunner band to Bullet for My Valentine and was formed in 1998 by Matthew "Matt" Tuck, Michael "Padge" Paget, Nick Crandle, and Michael "Moose" Thomas while studying music at Bridgend College. Playing Nirvana and Metallica cover songs, the band released a two-track EP in 2002, You/Play with Me, which was produced by Greg Haver. The EP was financed through the Pynci scheme for new Welsh musicians and the release garnered radio airplay on BBC Radio 1's broadcast at Newport's T.J.'s. Jeff Killed John's music followed the nu metal trend set by bands such as Korn and Limp Bizkit. Bassist Crandle left the band on the eve of entering the recording sessions for You/Play with Me and was replaced by Jason James. The band then changed their name to Bullet for My Valentine and reworked their musical strategy; they decided to play thrash metal songs with "harmony guitars and big angelic choruses" according to frontman Tuck.
Roadrunner Records showed interest in Bullet for My Valentine and offered the band a deal. The offer was ultimately turned down, and the band signed a five-album record deal with Sony BMG and a UK licensing deal with Visible Noise. According to Tuck, they chose Sony because, "We thought that a lot more doors would be open to us." A self-titled EP was released on November 15, 2004 in the UK. Produced by Colin Richardson, it featured five tracks and marked the band's first official release. A second EP, Hand of Blood, was released on August 22, 2005 through Trustkill Records and was only available in the US; the release contained one extra track than the self-titled EP, "4 Words (To Choke Upon)". Daniel Lukes of Decibel Magazine reviewed the EP by stating, "The worst part is that the music itself isn’t all that bad, for the genre." He went on to comment that the band should be "embarrassed" about the release. Zeromag's Josh Joyce complimented the band on "how technical they can get without confusing the kids".
According to Scott Alisoglu of Blabbermouth.net, "Tears Don't Fall"'s "twin lead work, thrashy romps, galloping tempos, and a hot solo launch the track out of mediocrity".
Bullet for My Valentine's debut album, The Poison, was released on October 3, 2005 in the UK and on Valentine's Day, 2006 in the US. It entered the Billboard 200 at number 128, and attained number 11 on the Independent Albums chart. On January 30, 2009, the album was certified gold by the RIAA after 500,000 copies were sold in the US. Four singles were released from The Poison: "4 Words (To Choke Upon)", "Suffocating Under Words of Sorrow (What Can I Do)", "All These Things I Hate (Revolve Around Me)", and "Tears Don't Fall". Bullet for My Valentine promoted the album by touring across the world. In 2005, with increased popularity, they played on the larger Download Festival Snickers stage; in 2006, the band were moved to near the top of the main stage bill. Other tours included opening for Metallica and Guns N' Roses in the summer of 2006, the Vans Warped Tour, Kerrang! tour, and Earthday Birthday.
The band's performance at the Brixton Academy in London on January 28, 2006, was filmed for their first DVD, The Poison: Live at Brixton. During June 2007, Tuck suffered from laryngitis, which let to an emergency tonsillectomy in July. Bullet for My Valentine were forced to cancel several shows, including supporting Metallica for three dates on their Sick of the Studio '07 tour on June 29 in Bilbao, July 5 in Vienna, and July 8 at the recently completed Wembley Stadium in London. Unable to speak, Tuck wrote that as soon as doctors cleared him he would be in the studio working on the band's next album.
Bullet for My Valentine's music has been described by critics as metalcore, heavy metal, and thrash metal. The band has cited being influenced by bands such as Metallica, Annihilator, Pantera, Machine Head, Iron Maiden, Testament, Stuck Mojo, Slayer, Judas Priest, and Megadeth. These bands inspire Bullet for My Valentine's "catchy vocals, aggressive riffs and melodies" according to Thomas. The band themselves consider their music as hard rock with Tuck went on to state that "…we’re a hard rock band with metal influences, and I’ve said that from Day One.” Kirk Miller of Decibel Magazine praised the band for the effort in synchronised song structures. When asked of their views on their looks, members of the band have stated that they would not change their sound or image for a commercial approach; Tuck commented that, "Without sounding harsh, we're more interested in what our music sounds like than what our fucking hair looks like."
They have now released their latest album, titled ‘Scream, Aim & Fire’ taking a new musical direction, and partially changing both the band’s sound and fan base. With the new album, Bullet for My Valentine are clearly trying to change their style from metalcore to also encorporate elements of a more modern heavy metal sound, keeping the basic elements old-time fans love about Bullet, but at the same time diverging into a new and interesting sound.