what's with people getting their friends to do stuff at weddings can't they have a disco and some ham sandwiches and let everyone have a natter and the odd drink in peace?

did a fine arrangement of "Here There And Everywhere" when Mrs Fox and I tied the knot.
Then we got stuck into a barrel of Bath Ales' "Gem" and before long you could hear me sat in the corner trying to remember the opening chords to "Stairway"...

....from Steve Earle's "I Feel Alright" album.

I find it always gets feet tapping when I play it at parties on acoustic.

It's a boy meets girl(or maybe boy would like to meet girl)song with a simple rockabilly shuffle.

Surely he must have one you can do.

by Billy Bragg was the song that first popped into my head when I saw this question.

Honest, romantic, unsentimental.

It's on his 'William Bloke' album.

His song Anyhow I Love You is simple and says what needs to be said. You can find it on Texas Cookin'.

Think this is just spot on and very underrated.

of Stranger ~ The Sisters Of Mercy

Years ago a friend employed a singer with a guitar at his wedding. All was well with the official set (pre-disco/sandwiches) trouble was someone encouraged the chap who was considerably refreshed by this time to do a little reprise post-disco. Cue an anguished, empassioned version of Amsterdam (I thought it was a Bowie track but google tell me the original was by Jacques Brel). The sight of several Aunties over from Ireland visibly blanching as he roared out the line about the whores of Amsterdam and the nervous applause at the end has lived with me ever since. Be warned.

This is a not dark RT song which is lovely...

Old Thames Side
Appears on Front Parlour Ballads (2005)

As I was walking down by old Thames side
Well my foot and my heart seemed to falter
For there you were standing by Custom House Landing
Like Venus risen out of the water

CHORUS
And they’ll say it’s because I’m a fool in love
That I swear there’s no beauty before you
But those that deny or think that I lie
Well those are the ones never saw you

O there never was anyone perfect as you
As you stood there and smiled to greet me
And I looked for a phrase to capture your ways
But that’s a task will always defeat me

Alternatively, I reckon Happy Together by The Turtles would work acoustically - slow it down a bit and it should be a treat.

...Have Me.
It did the trick at our wedding. Mrs Skirky in full big white dress regalia and everything. Yes, we did the single version.

Northern Sky. Bloody lovely.

By the Waterboys - I was persuaded to sing it to start friend's wedding reception a few years back. Nice and simple, which is good because I had to teach the band it 5 minutes before we started.