The part of the day everyone still talks about at night.
Beer bike, paintball, pub crawl. The groom knows all of that, and he has probably organised it twice for someone else. Hardly anyone has seen a recording studio from the inside, and that is exactly the difference: when the door closes, the headphones go on and your own voice comes back over the monitors for the first time, it goes quiet for a moment. After that, not at all.
What happens here depends on your group. Some rewrite lyrics beforehand and bring them printed out. Others decide on the spot that a rap over a beat fits better. Some arrive with a guitar and a cajón and record something that genuinely sounds like a band. What they all have in common: this is not about singing well. It is about the recording sounding like you.
Right after the recording a group photo is taken for the CD case. You hand the CD over on the wedding day or play it the same night. And because the studio is two minutes from the S Bahn, the day carries on without a detour.