The large Mander organ that you see today was installed in 2006.  It is a three-manual mechanical (tracker) action instrument with 39 stops. It is played weekly during services and is used for practice, at concerts and during the International Organ Festival. St Peter’s had other organs before this one. The first organ is believed to have been built in 1661 for St George’s Chapel at Windsor Castle.  It is thought that this organ was subsequently moved to St Martin in the Fields in Trafalgar Square in London in 1674-5 and then from that church to St Peter’s in 1725.  This ancient organ was finally replaced by another one in the early 1970s, and this in turn was replaced by the Mander organ in 2006.