iTunes on shuffle just found Billy Bragg’s version of Jerusalem. This hymn has always moved me. Along with the lyrics, Wikipedia led me to some things I didn’t know about Blake’s poem, later set to music.

And did those feet in ancient time:

    And did those feet in ancient time,
    Walk upon Englands mountains green:
    And was the holy Lamb of God,
    On Englands pleasant pastures seen !

    And did the Countenance Divine,
    Shine forth upon our clouded hills ?
    And was Jerusalem builded here,
    Among these dark Satanic Mills ?

    Bring me my Bow of burning gold;
    Bring me my Arrows of desire:
    Bring me my Spear: O clouds unfold:
    Bring me my Chariot of fire !

    I will not cease from Mental Fight,
    Nor shall my Sword sleep in my hand:
    Till we have built Jerusalem,
    In Englands green & pleasant Land.

Nevertheless, the poem – little known during the century which followed its writing – was included in a patriotic anthology of verse published in 1916, a time when morale had begun to decline due to the high number of casualties in the First World War and the perception that there was no end in sight.
Under these circumstances, it seemed to many to define what Britain was fighting for. Therefore, Parry was asked to put it to music at a Fight for Right campaign meeting in London’s Royal Albert Hall. The most famous version was orchestrated by Sir Edward Elgar in 1922 for the Leeds Festival. Upon hearing the orchestral version for the first time, King George V said that he preferred that “Jerusalem” replace “God Save The King” as the National Anthem.
This is considered to be England’s most popular patriotic song, often being used as an alternative national anthem. It was used as a campaign slogan by the Labour Party in the 1945 UK general election. (Clement Attlee said they would build “a new Jerusalem”). “Jerusalem” is the unofficial anthem of the British Women’s Institute, and historically was used by the National Union of Suffrage Societies.[3]
The text of the poem was inspired by an apocryphal story which narrated that Jesus, while still a young man, accompanied Joseph of Arimathea to the English town of Glastonbury. Blake’s biographers note that he believed in the legend; however, the poem’s theme or subtext is subject to much sharper debate, probably accounting for its popularity across the philosophical spectrum. As a Romanticist paean the poem has come under criticism. Consequently some see it as unsuitable as an English National Anthem, and its reference to a foreign city as puzzling to other nations. It is unlikely that Blake intended such a literal interpretation, however, or that most who sing and love the song believe in such a literal reading of the lyrics; legends contain important truths to many people.

How about that?  And here is Billy: