The "Variations and Fugue on the Mediaeval Hymn to Saint Magnus" - about eleven minutes in duration - is the work of the English composer Clive Strutt in 1971. He intended it to be performed at a concert to inaugurate the newly rebuilt organ in the Cathedral in Kirkwall, Orkney. However, in the end there was no specific inaugural concert. There was, however, a private performance in 1972 by Dr J. A. Jeffrey in St Leonhard's Church, St Gallen, Switzerland. The hymn referred in the title exists in a manuscript at Uppsala University, Sweden and is noted by music historians as being one of the earliest examples known that uses parallel thirds. Although this work exists primarily as an organ solo, the individual movements were extracted by the composer in 1982 and incorporated into a Communion Service for the Day of Saint Magnus the Martyr, Earl of Orkney as a series of organ interludes.