Panic! at the Disco is an American alternative rock band, formed in Las Vegas, Nevada in 2005. Since its split, the band's line-up includes Brendon Urie (lead vocals, guitar, piano) and Spencer Smith (drums). Former members Ryan Ross (guitar) and Jon Walker (bass) left the group in 2009. The band has been described by critics as a variety of genres, most commonly pop punk, alternative rock, and baroque pop.

The band formed and recorded their first demos while they were all still in high school. Shortly after, the band recorded and released their debut studio album, A Fever You Can't Sweat Out (2005). Made known by the top ten lead single "I Write Sins, Not Tragedies", the album eventually was certified double platinum and met with much success. The group then wrote and recorded their second record, Pretty. Odd., released in 2008. Marked as a drastic change in tone from their debut, it oversold commercial expectations but was met with critical success.