Composer: Albert Hay Malotte
Most anyone who has been to a church service or mass will know at least the text of this song, and likely would have heard this setting of The Lord's Prayer at some point. It is probably the most famous version of The Lord's Prayer ever sung. American composer/pianist/organist/educator Albert Hay Malotte composed it in 1935 and it has been a popular choice for church services and weddings ever since.
While it certainly can be done as an instrumental piece, it is best known as a vocal performance. It starts out quietly but builds to a triumphant finale that requires some decent vocal technique, so if you want this at your wedding, do ensure that the singer has the vocal "chops" to carry it off successfully. It is available in several different keys, so as long as you match the correct key to the vocal range of the soloist, it should be a pleasing rendition.
I've included several versions of it below, mostly done in the original classical style. Andrea Bocelli's is a good example of this, as is Charlotte Church's recording. There's even a boy's choir version which is really lovely, especially if you want a more choral sound. And I have included a piano solo version to give you an idea of what it would sound as a purely-instrumental performance.
Our Father, who art in heaven
Hallowed be thy Name
Thy kingdom come
Thy will be done on earth
As it is in Heaven
Give us this day our daily bread
And forgive us our debts
As we forgive our debtors
And lead us not into temptation
But deliver us from evil
For Thine is the kingdom
And the power and the glory forever