Singer will play BBC Radio 1 bash next month
There's high entries for The Last Shadow Puppets and The Kooks too
Singer cites business reasons for later hearing
Singer may also play a private gig in the UAE
She'll perform on April 30 at Roseland Ballroom
Proceeds will benefit Raising Malawi
Singer reveals tales about new album, 'Hard Candy'
Singer claims David Banda would be dead if she hadn't intervened
Singer gets green light to officially adopt David Banda
Ticket websites have a gig listed in September