This is one of my favorite Psalms! And this is a quite nice chant; here's the Coverdale Psalter version:
1 The Lord is King, and hath put on glorious apparel *
the Lord hath put on his apparel, and girded himself with strength.
2 He hath made the round world so sure *
that it cannot be moved.
3 Ever since the world began hath thy seat been prepared *
thou art from everlasting.
4 The floods are risen, O Lord, the floods have lift up their voice *
the floods lift up their waves.
5 The waves of the sea are mighty, and rage horribly *
but yet the Lord, who dwelleth on high, is mightier.
6 Thy testimonies, O Lord, are very sure *
holiness becometh thine house for ever.
Here's Wikipedia on Psalm 93:
Psalm 93 (Greek numbering: Psalm 92) is the 93rd psalm in the biblical Book of Psalms. One of the Royal Psalms, Psalm 93-99, praising God as the King of His people.
Uses - Judaism
And here's something about Garrett:
George Mursell Garrett (8 June 1834 – 8 April 1897) was an English organist and composer.
Garrett was born in Winchester where his father was master of the choristers at Winchester Cathedral. He later served as assistant to Samuel Sebastian Wesley at Winchester. Garrett was appointed the Director of Music at St. John's College, Cambridge in 1857 and held the position for forty years.
Garrett wrote music for the Anglican Church in the form of service settings and anthems. He is perhaps best represented today by his Anglican chant setting of Psalm 126.
He is buried in the Mill Road cemetery, Cambridge.