We hasn't realised Tina Turner had officially retired, but apparently she had. Only now, she's coming back for charity:
"I am delighted to be associated with a charity which reaches out to so many young people. If my songs make people dig deep into their pockets, then I will have achieved my aim."
The money will go to Caudwell Hall; Turner's gig will be at the Natural History Museum - quite brave of Tina to agree to play in a place known for exhibiting the remains of long-lost and half-forgotten creatures.