Longplayer is a composition by the musician and artist Jem Finer designed to last a thousand years without repeating. It began at midnight on 31 December 1999 and is scheduled to complete its cycle at the end of 2999, after which it will start again. Commissioned by Artangel, it is cared for by the Longplayer Trust, whose task is to plan for the survival of the piece across generations of technology.
The music is composed for Tibetan singing bowls. Six sections of source music play at once, and software combines them so that no combination recurs before the millennium is over. Today it is generated mainly by computers running code written in SuperCollider, and it can be heard in the lighthouse at Trinity Buoy Wharf in London, at other listening posts and through a live stream. A graphic score allows live performance by six players on 234 bowls, and a 1,000-minute version was performed at the Roundhouse in London in 2009.