"Chelsea Dagger" is a song by Scottish rock band The Fratellis and their second single. It was released on 28 August 2006. It is taken from their debut album Costello Music, which was released in the United Kingdom on 11 September 2006. It is supposed to be named after both Jon Fratelli's wife Heather, a burlesque dancer whose stage name – Chelsea – he borrowed for the song, and also as a play on the name of pop singer Britney Spears.
This song was Number 77 on Rolling Stone's list of the 100 Best Songs of 2007.
"Chelsea Dagger" is the goal song of the NHL's Chicago Blackhawks. The song was first used after owner Rocky Wirtz inherited the team from his father, Bill, and introduced more up-tempo music in an effort to attract younger fans. The song became a sensation during the Blackhawks' run to their first Stanley Cup in 49 years, in 2010. The success of the Blackhawks has led "Chelsea Dagger" to be adopted as a goal song by the University of North Dakota, among others. Blackhawks Executive Producer, Tom O'Grady, "We aggressively searched for a memorable goal song, then heard Chelsea watching a Celtic FC match and was immediately struck by the song's quirky and contagious chant..." It wasn't an immediate hit, however. "The first few games playing Dagger fan responses were pretty tough, but at the same time the Hawks started playing very well piling up the goals and victories and boom... Chelsea was adopted as the team's anthem quickly became a huge part of the Blackhawks brand experience."
"Chelsea Dagger" has been played after the London Knights score a goal since the start of the 2011–2012 season. At the home opener in 2012, a small number of fans (in section 113) began to move their arms up and down (rotating at the shoulder with elbows static at 90° and hands in a fist) to the beat of the song, and it quickly spread throughout the crowd to become a phenomenon at each game (as of 16 December 2012).