Panic! at the Disco is an American rock band that was formed in 2004 in Las Vegas, Nevada. Originally, the band consisted of four members, but over the years, only the lead vocalist, Brendon Urie, has remained. Their debut album, "A Fever You Can't Sweat Out," released in 2005, gained huge success with hits like "I Write Sins Not Tragedies." The band's music style often combines elements of pop, punk, and alternative rock. They have since released several more albums, with each showcasing their evolving sound. Panic! at the Disco's live performances are known for their high energy and theatricality, with Urie impressing audiences with his vocal range. Over the years, they have gained a dedicated fan base and have received critical acclaim for their unique musical approach.