I planned my cousin’s wedding back in November, including readings and music. What folks should remember, in my opinion, is that there is a hierarchy of music that should be sung at Mass (weddings included).
Even more important than the entrance processional and the recessional are the parts of the Mass. The responsorial psalm should be sung, if possible. The Gospel Acclamation (Alleluia or the Lenten settings) needs to be sung. If it is not sung, it is omitted. The Sanctus, Memorial Acclamation and the Great Amen need to be sung. The Agnus Dei should be sung as well.
For the entrance processional, I chose the instrumental version of Jesu, Jesu Joy of Man’s Desiring. The parts of the Mass were all sung, including the responsorial psalm. The offertory (wherein I had my aunt and the groom’s mother bring up the gifts) was a Spanish-language hymn called “Donde Hay Caridad y Amor”. The Communion hymn was Panis Angelicus and the recessional was the instrumental to Sing with all the Saints in Glory (Ode to Joy). The Ave Maria was used while my cousin presented her bouquet to the Blessed Mother before the recitation of the post-Communion prayer. If the celebrant is going to use incense (my parochial vicar was the celebrant of my cousin’s wedding Mass and he incensed not only the gifts, but, the couple as well), it would nice to play an instrumental. In his case, though, he chanted a Marian hymn in Latin.
I hope this helps.