"Chelsea Smile" is a song by British rock band Bring Me the Horizon. Produced by Fredrik Nordström and Henrik Udd, it was featured on the band's 2008 second studio album Suicide Season. The song was also released as the second music video from the album on 19 January 2009. Travie McCoy and KC Blitz produced remixes of the track for the album's special edition reissue, Suicide Season Cut Up!, which was released in 2009.

"Chelsea Smile" has been identified as evidence of Bring Me the Horizon's musical development on Suicide Season; Exclaim! writer Dave Synyard praised it, alongside "It Was Written in Blood", for featuring "catchier rhythms, lessened guttural vocals and more structured songwriting, as opposed to reverting to a technical onslaught of guitar riffs". When asked about this change in approach in relation to the two songs, vocalist Oliver Sykes explained that "I think it's good when a band can be really heavy and still have catchy hooks and riffs without it being cheesy and typical", adding that the band were "trying to make the heaviest and catchiest music possible".

For the Cut Up! portion of the 2009 special edition reissue of Suicide Season, remixes of "Chelsea Smile" were produced by Jamie Kossoff and Jon Courtney under their KC Blitz moniker, as well as Gym Class Heroes frontman Travie McCoy. According to set list aggregation website setlist.fm, "Chelsea Smile" is the song performed most frequently at Bring Me the Horizon concerts. It has been included in the set lists of several high-profile shows, including the band's performances at Wembley Arena in 2014 (documented on the live video album Live at Wembley), Reading and Leeds Festivals in 2015 and Alexandra Palace as part of the That's the Spirit Tour in 2015.

...
Wikipedia