Lord Grey's are long overdue a regimental song to boost our presence on the field, scare off the Royalists, etc.
The above image is a setting of Psalm 68, a suitable soldierly song for the period: it was sung by Fairfax's troops as they stormed Leeds in January, 1643. Lord Grey's should easily be able to produce a suitably rumbustious version with which to wow the opposition.
This setting appeared in the (much hated) Anglican Book of Common Prayer, but also appears in the more Puritan Scottish Psalter of 1650. Such was the popularity for this Psalm generally among Protestant armies of the period that became known as 'The Huguenot Battle Hymn'.
Below are the words to the first two verses, with musical notation as a guide. A midi file for the tune can be found here: http://www.hymnary.org/text/let_god_arise_and_then_his_foes
Let God arise, and then his foes
will turn themselves to flight:
His enm'ies then will run abroad
and vanish out of sight;
And as the fire doth melt the wax,
And wind blow smoke away,
So in the presence of the Lord,
the wicked shall decay.
But righteous men before the Lord
shall heartily rejoice:
they shall be glad and merry all
and cheerful in their voice.
Sing praise, sing praise unto the Lord
who rideth in the sky:
extol the name of Jah our God
and him do magnify.
The quality of the midi isn't brilliant, but you'll get the general idea.
Happy psalm psinging!