I Vow to Thee, My Country is a British patriotic song on a poem by Sir Cecil Spring, written in 1921. Holst adapted the music from a section of Jupiter, from his suite The Planets, to create a setting for the poem. The melody was slightly extended so as to fit the words correctly. At the request of the publisher, he made a version as a unison song with orchestra. This was probably first performed in 1921 and became a common element at Armistice memorial ceremonies, especially after it was published as a hymn in 1926. Holst's daughter Imogen recorded that at "the time when he was asked to set these words to music, Holst was so over-worked and over-weary that he felt relieved to discover they 'fitted' the tune from Jupiter".
