I agree with much that has been said: Martin Carthy is a brilliant interpreter of folk song (records the odd bit of rubbish though!), a brilliant guitarist and a really nice guy. But there are other "Martin Carthys": Nic Jones, Tony Rose etc. Martin Carthy started off as a skiffler as many pop singers did but switched to folk music instead. So I fully agree with Metchosin, Lonnie Donegan has had the biggest influence on folk music UK (perhaps USA too) this century. And there's only one Lonnie Donegan. Dr John