Just to remind you of the songs:
As we know them from various places on here:
Lee- Bon Jovi -Living on a Prayer
Ben - Michael Jackson (& Diana Ross) - Ease on Down
Keith - Barry Manilow - Could it be Magic
Lewis - Neil Diamond - Sweet Caroline
Ben and Keiths duet - Cliff Richard & Sarah Brightman - Only You (Starlight Express)
Just in case you're thinking they're spearing Keith with a Disco (Take That) number bear in mind that Keith will most probably do the original slow, epic, emotional version of CIBM. He's been wanting a big ballad for a few weeks and always said he sings operatic stuff. Well, this is about as close to opera as you can get and I think it'll show him off to his best.
Sweet Caroline will also test out Lewis as well as giving him a real chance to shine, its a great song.
There is an acoustic version of Living on a Prayer, but either is gonna give Lee a good chance.
The only one I have slight trouble with is Ben's, but then again it is a 'showtunes' type show and this is pretty close to a showtune, coming from a musical film (The Wiz). Unfortunately the film was a complete flop. Still its a very bouncy song which is action packed, and apparently he's very happy with it.
Anyhoo, said more than I planned to there, but I think they've picked good 'choons' there.