Fightstar are a British rock band from London that formed in 2003. The band is composed of lead vocalist, guitarist and keyboardist Charlie Simpson, guitarist and co-vocalist Alex Westaway, bassist Dan Haigh and drummer Omar Abidi. Generally considered a post-hardcore band, Fightstar are known to incorporate metal, alternative rock and other genres into their sound. During the band's early days, they were viewed sceptically by critics because of Simpson's former pop career with Busted.

On 24 September 2014, the band's website was updated to include a countdown timer accompanied by text reading "News ...". The timer ended on 13 October with the announcement of a ten-year anniversary show at the Forum in London. A statement from the band followed: "It has been 10 years since the inception of this band and we wanted to celebrate it with a bang. We want to thank you all for your love and support over the past ten years and we can't wait to commemorate this milestone with you guys." The concert sold out in minutes; due to demand a second concert was scheduled at O2 Academy Brixton for December, which was later postponed until February 2015. With news of the postponement came an announcement of additional dates in Birmingham, Glasgow and Manchester. On 25 February, it was confirmed that the band would be third-stage headliners at the 2015 Download Festival.  On 12 May 2015, Simpson posted on Instagram that Fightstar had returned to the studio to work on new material with producer Carl Bown and began using Twitter for updates on the progress of the album. On 22 July it was announced that the band would release Behind The Devil's Back on 16 October, with a string of UK dates promoting the album to follow. On 26 July the BBC Radio 1 Rock Show introduced "Animal", the band's first new song in five years which was released digitally on iTunes on 7 August.  On 10 November 2015 Simpson reunited with Busted to record new music and tour, saying that Fightstar would continue to tour and release music as a "passion project" for its members.

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