I came across this site thought it was really helpful, it lists the most popular songs to pick for ur wedding slideshow, I know many of us can't decide (atleast I cant) so maybe this will help with ur selection
Popular Songs for Wedding Slideshows? | Favor Ideas
For the Bride:
Brown-Eyed Girl by Van Morrison,
Isn't She Lovely by Stevie Wonder,
Let Them Be Little by Billy Dean,
Then They Do by Trace Adkins, and
You are so Beautiful by Joe Cocker.
For the Groom:
100 Years by Five for Fighting,
Best Day of My Life by George Strait,
My Guy by Diana Ross and The Supremes,
The Boy I'm Gonna Marry by Darlene Love, and
Then They Do by Trace Adkins.
For the Bride and Groom:
Better Together by Jack Johnson,
From This Moment by Shania Twain,
God Blessed the Broken Road by Rascal Flatts,
How Sweet It Is by James Taylor,
It Had to Be You by Frank Sinatra,
I Will and In My Life by The Beatles, and
L.O.V.E. by Nat King Cole.
Equally popular choices for the bride and groom are:
Look at Us by Vince Gill,
Love Will be Our Home by Susan Ashton,
Making Memories of Us by Keith Urban,
On My Wedding Day by Don Henley,
Sunrise, Sunset by Louis Armstrong,
This Will be an Everlasting Love by Natalie Cole,
What a Wonderful World by Louis Armstrong,
You and Me by Life House, and
You Had Me from Hello by Kenney Chesney