If your a fan of Henry V you'll recognize this song.  The title is Non Nobis Domine by Patrick Doyle.  The words are based on Psalm 115:

Non Nobis Domine

Non nobis, Domine, Domine
Non nobis Domine
Sed nomine, sed nomine
Tuo da gloriam

Not unto us, O Lord, not unto us,
but unto thy Name give the praise