"Happy Song" is a song by British rock band Bring Me the Horizon. Produced by keyboardist Jordan Fish and vocalist Oliver Sykes, it was featured on the band's 2015 fifth studio album That's the Spirit and released as the second single from the album on 13 July 2015. The single topped the UK Rock & Metal Singles Chart and reached number 55 on the UK Singles Chart, number 2 on the US Billboard Mainstream Rock chart and number 19 on the Billboard Hot Rock Songs chart. One of the first songs written for the album, "Happy Song" embodies the main theme of That's the Spirit, with lyrics primarily written about depression. Due to its repeated use of the titular phrase, the song is considered the unofficial title track of the album, and has been performed as the opening song at the majority of dates on the album's promotional concert tour. Many critics have hailed the track as a highlight of the album, praising its heavier style and prominent guitar riff. In the weeks leading up to the release of "Happy Song", Bring Me the Horizon teased news of their upcoming fifth studio album That's the Spirit by sharing images of the album's umbrella artwork and the smiley face cover for the single. On 12 July 2015, the song was premiered on the BBC Radio 1 Rock Show with Daniel P. Carter as that day's "Rockest Record", before it was made available for individual purchase online. In September, it was released as a limited edition 7" vinyl exclusive to HMV. No music video was produced for the track, although a live video filmed at Leeds Festival in August 2015 was released in October, which featured a parody health and safety video introduction described by DIY magazine's Tom Connick as "loony". Also in October, the song (along with "Throne") was used as an official theme song for the professional wrestling show NXT TakeOver: Respect. In October 2015, the song was featured during a montage sequence on the Castle season 8 episode "PhDead". In March 2016, it was featured on the soundtrack of the video game EA Sports UFC 2. The song was later included on the video game soundtrack for WWE 2K22, released in 2022. On 17 February 2016, Bring Me the Horizon played "Happy Song" at the NME Awards show in Austin, Texas. During the performance, frontman Oliver Sykes jumped on the table at which Godlike Genius award winners Coldplay were sitting, causing it to collapse. Some news writers claimed that Sykes had intentionally targeted Coldplay as a "protest", although the vocalist later responded by confirming that "It was in no way a protest against Coldplay". Coldplay frontman Chris Martin reacted positively, describing the incident as "great, very rock n roll". Writing about the event, the NME praised the group's performance as "a real reminder of the power of raw performance ... it went down an absolute storm".