Really, I'm thinking of calling that duet segment something else more appropriate - nap time.
I'm looking forward to the other two far more, not because they will necessarily be better, they may not be, but because I have no idea what to expect.
Barlow and Marcus have two problems, always a woman is a great , great song (Ive seen Billy Joel several times, at his peak, fantastic entertainer), but its not a 'wow' song , and hes more predictable than rain on a bank holiday.
its going to be gary on piano and marcus singing, I like marcus, but he isnt strong enoough vocally to pull that off well enough to get the big reaction.
I have no idea what the other two will sound like, the biggest potential wow factor is Tulisa, because an awful lot of the audience wont have even heard her sing before, that could well be the deciding factor.