JLS have been added to the lineup for this month-long iTunes Festival thing.
The 'Do You Feel What I Feel?' hitmakers will sing some songs while dancing in a co-ordinated fashion at the Roundhouse in London on September 6.
Other acts performing on different nights during the same month are One Direction, Olly Murs, Rebecca Ferguson and Usher.
There's more information on who's playing when, and how to get tickets, here.