Gary Barlow clip

A dream collaboration between JLS and One Direction is just one of the treats in store at the Children in Need Rocks concert on Thursday night.

Organised by X factor judge and Take That supremo Gary Barlow, the line-up includes some of the biggest names in pop.

Coldplay, N-Dubz and Lady Gaga are all set to perform.

But how does he persuade them to take part?

Watch our short clip to find out.