[Swampcabbage]

Provide a list of all the songs you can do. (Just like a Karaoke machine). Be prepared to transpose it for the singers range (though much of the fun for Karaoke is trying to crack it out like the original... and failing miserably at it). Play straight through the song as close to the original as possible (don't stop for them to remember words or cut across to the bridge).

If you can provide a Karaoke video monitor with the words, this would help out a lot. Otherwise, have sheets with the lyrics printed out.

It's just like Karaoke, but live, some would argue that most cover bands do this anyway. (Especially if the crowd has had a few too many).

It can be fun though if you don't take it too seriously. Enjoy.