Just been reminded of this and thought worth sharing...

A Happy Birthday to you, may the dear lord bless you.
Praise the Lord for his goodness and mercy each day
May he guide you and keep you on Heaven's highway
Here's a prayer with our blessing - Happy Birthday to you.

Or something simillar, more well known...

Happy Birthday to you, a Happy Birthday to you,
May you feel Jesus near, every day of the year,
Happy birthday to you, a Happy Birthday to you,
And the best one you ever had!