I made two slideshows for parents at the Catalyst Foundation Culture Camps. Here are the songs used:
Time of Your Life - Green Day (last minute change)
Do I Make You Proud - Taylor Hicks (surprisingly good, starts slow but builds in energy)
Sleeping Child - MLTR
(Out of those three, I really like the last one. It's great when you have a lot of sleeping pictures ^_~)
I used two Tarzan songs for the second one, You'll Be In My Heart by Phil Collins and Two Worlds.
The Milky Way upon the heavens
is twinkling just for you
and Mr. Moon he came by
to say goodnight to you
...
Oh my sleeping child
the world's so wild
but you've build your own paradise
That's one reason why
I'll cover you sleeping child
Personally, if you don't mind not having lyrics, I'd go with a piano solo by Jim Brickman =)