An art of busking

In London you are exposed to buskers on every step: streets, tube, shopping malls and enywhere else you can imagine. In majority of the cases they are between good and very good, some of them are outstanding. Also most of them is very original - my personal favourite is a didgeridoo guy from Picadilly Circus tube station (although haven't been there for a while trying desperatelly to avoid crowds there and I don't know if he's still there).
But I was shocked and amased by this guy in Salzburg (sorry for the quality of the recording, no idea where this howling came from! :)
London buskers have still something to learn...