DF and I are getting married soon, we are having a traditional church ceremony as we're both Christian. We've picked out the hymns we want but quite a lot of our guests aren't religious or have faiths other than Christianity so wouldn't be familiar with them - to be fair some hymns aren't even that common in the churches we know! But I've been to weddings where everyone shares the confused look and mumbles through to be polite and it's just quite embarrassing...
I would like to send round an email to all our guests with links to the songs (there are only 3) just so they can familiarise themselves with them if they want to. Obviously if people don't want to join in, that's absolutely fine! Just to have the option if they like. Would that be unreasonable?