How about, "What a wonderful world"? Lyrics:
I see trees of green, red roses too
I see them bloom for me and you
And I think to myself, what a wonderful world
I see skies of blue and clouds of white
The bright blessed day, the dark sacred night
And I think to myself, what a wonderful world
The colours of the rainbow, so pretty in the sky
Are also on the faces of people going by
I see friends shakin' hands, sayin' "How do you do?"
They're really saying "I love you"
I hear babies cryin', I watch them grow
They'll learn much more than I'll ever know
And I think to myself, what a wonderful world
Yes, I think to myself, what a wonderful world
This song always makes me get tears in my eyes. It would be lovely playing while photos go by.

And may I say that I think it's wonderful that you're doing this for your mom. She must be a very special lady, and you must be a very special child for her.
-Dorothy (LadyZolt)