The pianist Peter Donohoe has managed to commit 75 concerti to memory.
Ian Richardson , who performed Hamlet 30 years ago, can still recite it. Paul Daniels can remember the name of every member of his audience. And Benny Green can still name the Arsenal team from 1930.
Alan Titchmarsh talks to these and other great recollectors in an attempt to discover how people's memories work.
Producer Rosie Bouiton. Stereo