Irish Wedding Song (the) ()
Author: Ian Betteridge
Copyright: September Music

Here they stand, hand in hand
they've exchanged wedding bands
today is the day of their dreams and their plans
and all we who love them just wanted to say
May God bless this couple who married today

CHORUS
In good times and bad times
in sickness and health
may they know that riches are no need for wealth
Help them face problems they'll meet on their way
Oh God bless this couple who married today

May they find peace of mind comes to all who are kind
May the rough times ahead become triumphs in time
and may their children be happy each day
Oh God bless this family who started today

As they go may they know every love that was shown
and as life it gets shorter may their feeling grow
wherever they travel, wherever they stay
May God bless this couple who married today

http://www.irishsongs.com/lyrics.php?Action=view&Song_id=168

Harmonica tab here.
(Don't know how much help that will be!)
Find a harmonica player?