Help!! Catholic wedding music

Hello,
Me and my fiancé decided to get married in a Catholic Church and I have recently been researching all my suppliers , including singers. In my vision I will have a singer during the ceremony (majority of packages include 20mins while your guests enter and are waiting, 1 walk down the aisle, 2 signing the register, 1 exit song) all appropriate songs of course. but it has suddenly dawned on me that I won’t be able to do this in the church and they will require me to only have religious music. To be totally honest the only song I care about is the one I walk down The aisle to - for YEARS I have pictured a particular song to walk to and are they not going to allow it?! It is obviously an appropriate song but after reading a few other forums , it has to be an actual religious song… btw I totally get that music during the wedding itself will be hymms- it is purely the aisle song I have now become stressed about as I don’t want a dull song for this please anyone who has married in a Catholic Church advise !! (Btw I do know I will need to contact the church to confirm with them individually but I would like to hear other experiences) thank you!!!!