Not the city but the song.  My only reference has been the first time I heard the Emerson, Lake and Palmer version back in 1974 and I always loved it.

Little I knew about the history of the song and indeed how rich it is till this morning via Bayou Renaissance Man:

To honor Britain and its people as they regain some of their independence, and in the hope that the island nation may be restored to at least some of its former glory, here’s a quintessentially English anthem.  It’s “Jerusalem”, a poem by William Blake set to music by Sir Hubert Parry.  The text may be found here.  This rendition is from the Last Night of the Proms concert in 2009;  the annual “Last Night” traditionally features the song in its conclusion.

And, of course, the video:

And did those feet in ancient time,
Walk upon Englands[b] 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

England does not have an official anthem (another thing I did not know) but God Save The Queen is the one most used as although many people have commented and lobbied to make Jerusalem as the official anthem. If the reaction of the people of the Proms 2009 video is any indication, Jerusalem should indeed represent England.