Ideas for Prelude:
____"Play Vitamin String Quartet Versions of Pop Songs"
____"Play Christian Pop"
____"Play Bach, Vivaldi and other nice, full-orchestra (but not bombastic) Baroque"
____"Play Piano Guys Versions of Pop songs"
____"Play Various Piano and Violin Covers of Popular Music"
____"Play Country Love Songs"
____"Play Colbie Caillat, Norah Jones, and Ingrid Michaelson soft pop love songs"

Sometimes there is a song for the Seating of Parents:
____"Better Together" by Jack Johnson
____"You Raise Me Up" by Josh Groban
____"What a Wonderful World" by Louis Armstrong

Wedding Party Processional:
____"Stand By Me" by Florence and the Machine
____"Bittersweet Symphony" by Aranbee Pop Symphony Orchestra
____"Pachelbel Canon in D" (Do you like full orchestra, classical guitar, celtic...or?)
____"Somewhere Only We Know" by Simply Three

Bride's Processional:  (The Bride could share the same music as the wedding party)
____"Butterfly Waltz"  Brian Crain
____"A Thousand Years" Piano Guys
____"Fanfare and Trumpet Voluntary" Canadian Brass
____"Jesu, Joy of Man's Desiring" Classical Full Orchestra
____"Marry You" Bruno Mars
____"Marry You" Violin Instrumental
____"Marry Me" Train
____"Never Stop (wedding version)" SafetySuit
____"I Get to Love You" by Ruelle

Mid-Ceremony Music for Mixing Sand, Lighting Candles, etc.:
___"Grow Old With You" Guitar Instrumental version of the Adam Sandler tune.
___"Grow Old With Me"  Vocal version by Mary-Chapin Carpenter
___"Here We Stand"  by T Carter Music (two versions: acoustic guitar or full band?)

____"(This Will Be) An Everlasting Love" by Natalie Cole cued up to the refrain
____"Wedding March" by Mendelssohn
____"Signed Sealed Delivered"  Stevie Wonder, could be cued up to the 2nd refrain
____"All You Need Is Love"  Beatles  cued up 8 seconds into it
____"Now That We Found Love"  Heavy D and the Boyz
____"Crazy in Love" by Beyonce
____"Best Day of My Life" by American Authors cued up to :38

More ideas:  You are welcome to have me run a second microphone to a live vocalist or instrumentalist.