Steve....How old would you say the groom's parents are? If they are late 50's, early 60's maybe:
Richie Valens - We Belong Together
Love Is A Many Splendored Thing - The Four Aces
My Special Angel - The Crests
True Love - Bing Crosby Grace Kelley or (Rosemary Clooney)
Or something a bit newer...
I Will Love You So For always - Atlantic Star
With You I'm Born again - Billy Preston & Syretta
The First Time Ever I saw Your Face - Celine Dion
Endless Love - Diana Ross, Lionel Ritchie
Always & Forever - Heatwave
all are Waltz's
You might check Braddock Iz and see what He has, Chuck may also have a couple good ones...... more Island/Tropical types........