25 Years – The Chain is a box set by British-American rock band Fleetwood Mac originally released on 24 November 1992. It consists of four CDs, covering the history of the band from its formation in 1967 to 1992. The set features several previously unreleased studio tracks, new mixes, live recordings, and a different version of the international hit single 'Tusk'. Feb 14, 2019.