LONDON, August 8 (AFP) — Doctors fear that the identity of a mysterious mute pianist found wandering on an English beach in April might never be known, a British newspaper reported today. "We have discounted a lot of the names and continue to look at those which remain. But there is no obvious lead — we haven't had someone bashing down the door saying, 'This is my son' or 'This is my brother'," an official at the Little Brook Hospital in Dartford, Kent, southeast England told The Independent. "Given the enormous amount of publicity about Piano Man, we think it...