Here's a list of popular hymns from over the years. For as many as possible, I added a youtube link so you can listen to them. Of course, there are other acceptable hymns that can be performed. 

Gathering - Bridal Party

Ode To Joy https://www.youtube.com/watch?v=WauWgEIb_Dg

Pachelbel's Canon    http://www.youtube.com/watch?v=hOA-2hl1Vbc

Trumpet Voluntary http://www.youtube.com/watch?v=zP0X2XsHuCk

Jesu, Joy of Man's Desiring https://www.youtube.com/watch?v=l3UuGPCCm_I

Processional - Bride

Any of the above

Bridal Chorus https://www.youtube.com/watch?v=P6rX3wlDsVI

Psalm:

Taste and See  https://www.youtube.com/watch?v=O-AeXLMpDJE

I Have Loved You https://www.youtube.com/watch?v=Bu6LfLiff-I

The Lord is Kind and Merciful https://www.youtube.com/watch?v=Zlx_m12MO_M

The Lord Is Compassionate  https://www.youtube.com/watch?v=iGPAP3djni8

Gospel Acclamation

Celtic Alleluia https://www.youtube.com/watch?v=wWV2s21wPjM

Chant Alleluia

Presentation of the gifts, Communion, candle lighting (if there is one)

*** If you expect a large crowd, you may want to choose 2 for communion ***

The Irish Wedding Song https://www.youtube.com/watch?v=O20TVHC9YFE

Lady of knock https://www.youtube.com/watch?v=Fm6ss1PBC1Q

Hail Mary, Gentle Woman https://www.youtube.com/watch?v=cN67U2lc7vQ

Here I Am, Lord https://www.youtube.com/watch?v=EcxOkht8w7c

Lord, When You Came https://www.youtube.com/watch?v=nff3jGFKorY

How Beautiful https://www.youtube.com/watch?v=y8ZonBMFat8

Ave Maria (Schubert) https://www.youtube.com/watch?v=2bosouX_d8Y

Ave Maria (Gounod) https://www.youtube.com/watch?v=OopipwYpYlo

Bread of life https://www.youtube.com/watch?v=e6Rv8XkfoRU

The Servant Song https://www.youtube.com/watch?v=kdmgpMfnjdU

The Supper of The Lord https://www.youtube.com/watch?v=0HRkaEzLhPE

There is Love https://youtu.be/aZbhrO4IEtI

Dedication To Mary and/or Communion meditation  

Ave Maria (Schubert)  https://www.youtube.com/watch?v=2bosouX_d8Y

Ave Maria (Gounod)  https://www.youtube.com/watch?v=OopipwYpYlo

Mary's Song https://www.youtube.com/watch?v=tFcd5IxortY

Lady of knock https://www.youtube.com/watch?v=Fm6ss1PBC1Q

Sing Of Mary https://www.youtube.com/watch?v=LJI0nX2YsVw

Holy is His Name  https://www.youtube.com/watch?v=0TEL_7TS5FE

Recessional:

Wedding March https://www.youtube.com/watch?v=4tDYMayp6Dk

Ode to Joy https://www.youtube.com/watch?v=WauWgEIb_Dg