Music in ceremony is so important.

I suggest you take time in deciding on what music to play for the ceremony.
If it is for a wedding then it is appropriate for you to choose the music of your choice.

Check out the section on music under the heading "weddings"

As long as it fits with the theme / feeling of the ceremony then it will be suitable.
CD's can be used, as long as they are tested prior to the ceremony.
Live music is also a great choice. There are many very talented artists that can cater for any budget.

If the ceremony is a funeral - then obviously it is wise to choose what the deceased would have chosen.
I can give you lots of ideas on music within ceremonies.