Blur 21 is a CD, DVD and vinyl box set encompassing the vast majority of music by Blur. It was released on 30 July 2012, commemorating the 21st anniversary of the release of Leisure, the band's first album. The release took place before the band's performance at Hyde Park as part of the 2012 Summer Olympics closing ceremony. One version of the box-set consists of eighteen CDs, three DVDs, one vinyl 7" record and a hardcover book acting as a complete biography of the band. The CDs contain all seven Blur studio albums released at the time, with the first five remastered, and with each album receiving a new second disc of B-side material; as well as four 'rarities' discs containing mostly previously unreleased material. The DVDs contain Showtime, The Singles Night and an all-new rarities disc. It is the band's most complete retrospective release.