The doctors also examined the techniques used by voice hearers to cope with their condition.

BBC: Hearing voices 'can be healthy'

The doctors also found that the experiences of voice hearers as children did not necessarily get worse as they grew older.

BBC: Hearing voices 'can be healthy'

But Mr Carr has passionately defended every stage of the trumpeter's progress, believing that his over-riding responsibility was to his hearers and to the new cultural awareness he was trying to work into his music.

ECONOMIST: Jazz books