David Bowie has quietly retired from the music business, according to his biographer.
Paul Trynka, who has written a new book about the singer/songwriter - called "Starman," believes Bowie will only return if he can "deliver something seismic."
The author tells Spinner.com, "My heart says he'll come back but my head says he's likely not to. I think he would only come back if he thinks he could deliver something that will be seismic. If you pop back into the stage, it's got to be something that has a big explosion and lots of flashes. It would be a bit of a miracle if he comes back, but miracles do happen."
Bowie has not performed live since he sang with Alicia Keys in 2006. His last album was 2003's "Reality."