Ceremony songs

I think there might be some confusion in the comments about what you're asking for - songs for the wedding party to walk into your reception? Or walking down the aisle to your ceremony? They are quite different things and music recommendations.

there's a bunch of great instrumental versions of these popular songs:

lover - taylor swift
wildest dreams - taylor swift

I get to love you - Ruelle

from this moment on - Shania Twain

thousand years - christina perri

perfect - ed sheeran

I personally love piano instrumentals. Our wedding parties are walking in to some Olafur Arnold songs. He makes beautiful music!

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Ask your bridesmaids and groomsmen to come up with a shortlist and you can pick. It's their walk, might as well give them something they can jam to.

Some piano songs I love are
Take my breath away-- I forget the artist but it's the song from Top Gun
All my life- KC and JojoEverything I do I do for you- Brian AdamsAll of me- John legendTurning Page- I forget the artist aswell but it sounds awesome with only piano.These are the songs I love piano wise. Good luck.
Spotify is a great place to search for piano solo songs.

Choosing a genre or artist of your choice that leads up to your aisle walk song can work to fit what you like. It can be moderate to walk to the beat. The pianist can work towards that idea and suggest what they know around that song.