Day 21 are an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 punk rock

Punk rock

Punk rock is a rock music genre that developed between 1974 and 1976 in the United States, the United Kingdom, and Australia. Rooted in garage rock and other forms of what is now known as protopunk music, punk rock bands eschewed perceived excesses of mainstream 1970s rock...

 group, led by Jimmy Pursey

Jimmy Pursey

Jimmy Pursey is an English singer and record producer. He was the founder and frontman of the English punk rock band, Sham 69 from 1976 to 1980, and from 1986 to 2006.-Biography:...

.

On 21 January 2008, Pursey announced that, due to ongoing confusion to fans, he would no longer be associated with the name Sham 69

Sham 69

Sham 69 is an English punk band that formed in Hersham in 1976.Although not as commercially successful as many of their contemporaries, albeit with a greater number of chart entries, Sham 69 has been a huge musical and lyrical influence on the Oi! and streetpunk genres. The band allegedly derived...

, and that his new band

Musical ensemble

A musical ensemble is a group of people who perform instrumental or vocal music. In classical music, trios or quartets either blend the sounds of musical instrument families or group together instruments from the same instrument family, such as string ensembles or wind ensembles...

 would perform under the name, Day 21.

The new band played their debut gig at Clockwork Marmalade, and frontman Pursey was backed by Mat Sargent (also from the old Sham 69) on bass; The Rev

The Rev

James Owen Sullivan , more commonly known by his stage name The Reverend Tholomew Plague, often shortened to The Rev, was an American musician, best known as the drummer for the American heavy metal band Avenged Sevenfold...

 (The Prodigy

The Prodigy

The Prodigy are an English electronic dance music group formed by Liam Howlett in 1990 in Braintree, Essex. Along with Fatboy Slim, The Chemical Brothers, and other acts, The Prodigy have been credited as pioneers of the big beat genre, which achieved mainstream popularity in the 1990s and 2000s...

 and Towers of London

Towers of London

Towers of London are a Punk Rock n Roll band, fromLondon, England, who formed in 2004. Their music mixes elements of rock and heavy metal music with 1977 style British punk...

) on guitar; and Snell

Snell

-People:*Ada Jack Carver Snell , American writer*Bertrand Snell , American politician*David Snell , American journalist*David Rees Snell , American actor...

 (Towers of London

Towers of London

Towers of London are a Punk Rock n Roll band, fromLondon, England, who formed in 2004. Their music mixes elements of rock and heavy metal music with 1977 style British punk...

) on drums.

On 27 May 2011 Pursey announced his decision to disband DAY 21 and reform Sham 69.