Ghost in the Machine

Many people claim to have seen ghosts.

But what should a bump-in-the-night actually sound like?

For Halloween, Ian Peacock puts together a soundtrack of the supernatural.

Brace yourself for a selection ranging from some "genuine" apparitions-taped at seances and haunted houses - to the noises of spectres invented for funfairs and theatre productions.

Producers: Robyn Read and Ian Peacock.

First broadcast on BBC Radio 4 in November 1999.