What is the fine-grained topic of the following text: Produced by Keith Barnfather and presented by Nicholas Briggs, this 2-disk compilation comprises six hours of documentaries featuring in-depth interviews with Gareth Thomas, Jacqueline Pearce, Jan Chappell, Stephen Greif, Peter Tuddenham and Mat Irvine. Only return the topic.
Documentaries featuring interviews with Gareth Thomas, Jacqueline Pearce, Jan Chappell, Stephen Greif, Peter Tuddenham, and Mat Irvine.