"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 Jon Fratelli's wife Heather, a burlesque dancer whose stage name – Chelsea Dagger – he borrowed for the song.
This song was Number 77 on Rolling Stone's list of the 100 Best Songs of 2007.
Chelsea Dagger is used heavily as a sports anthem. It is played at Stamford Bridge after Chelsea wins an important match. Jon Fratelli commented that their use of the song had resulted in the band supporting the club in the English Premier League.
Outside of soccer, it is best known as the goal song of the National Hockey League'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 teams' anthem quickly became a huge part of the Blackhawks brand experience."