I Vow to Thee, My Country

I Vow to Thee, My Country is a British patriotic song created in 1921 when a poem by Sir Cecil Spring-Rice was set to music by Gustav Holst.
History
The lyrics come from a poem by Cecil Spring-Rice that he wrote in 1908 when he was working at the British Embassy in Stockholm, Sweden. At first called Urbs Dei, or The Two Fatherlands, the poem is about how a Christian owes his loyalties to both his homeland and the Kingdom of Heaven. The first verse, as written, had a very direct and heated patriotism that has become less popular since the First World War.
In 1912, Rice was sent to Washington, D.C. as the British ambassador to the United States of America. While serving as ambassador, he tried to get President Woodrow Wilson to give up on neutrality and join Britain and her Empire in the war against Germany. After America entered the war, Rice was called back to Britain. Shortly before he left the United States, in January 1918, he re-wrote and re-titled Urbs Dei, after making big changes to the first verse to talk more about the huge losses that British soldiers were having in the war years.
The first verse talks about Great Britain, and mainly about those who died during the First World War. The end verse, that starts with the line "And there's another country", is talking about heaven. The final line of the end verse uses the Proverbs 3:17 as its base, which reads, "Her ways are of pleasantness, and all her paths are peace."
Music
In 1921 Gustav Holst changed the music from a section of the song Jupiter from his suite The Planets to create a setting for the poem. The music was made a bit longer so that it would fit the last two lines of the first verse; the result is usually called the Thaxted (named after the village where Holst lived for many years). This was first performed in 1925 and became very common at Armistice memorial ceremonies.
Later on, Z. Randall Stroope would arrange a choir version of this song called "Homeland." He still used the "Jupiter" theme from the planets but also used two additional verses of his own to pay homage to his father who marched in the Bataan Death March.
Lyrics
I vow to thee, my country, all earthly things above,
Entire and whole and perfect, the service of my love;
The love that asks no question, the love that stands the test,
That lays upon the altar the dearest and the best;
The love that never falters, the love that pays the price,
The love that makes undaunted the final sacrifice.
I heard my country calling, away across the sea,
Across the waste of waters she calls and calls to me.
Her sword is girded at her side, her helmet on her head,
And round her feet are lying the dying and the dead.
I hear the noise of battle, the thunder of her guns,
I haste to thee my mother, a son among thy sons.
And there's another country, I've heard of long ago,
Most dear to them that love her, most great to them that know;
We may not count her armies, we may not see her King;
Her fortress is a faithful heart, her pride is suffering;
And soul by soul and silently her shining bounds increase,
And her ways are ways of gentleness, and all her paths are peace.
The lyrics as usually sung without the middle verse because it is not suitable for modern use.
References
1920s songs
20th-century British poems
1921 works