BGT Boyband in Out of the Blue intro

[_sophie_]

I think it was two weeks ago the 'Out of the Blue' band in Britain's Got Talent were on..? Anyway, on their little intro leading up to their audition it basically started with Dec narating something along the lines of "There have been a lot of bands trying to make it through today.." and played clips of boy bands. One of those bands rehearsing were a group of about 4 I think and I remember the main guy was wearing a hat and glasses, think most of them if not all were black, and the main guy was rapping and I'm sure he went 'ok stop' at one point. Anybody have any idea what I'm on about and know what band this is?!!?! They sounded amazing!!