Obviously photos aren’t going to give you best idea so here are a couple of videos from Youtube as well.
What I like most about watching them is they completely love what they do and aren’t afraid to show that.
You can find details of when they busk on their Facebook page here. If you spot them make sure you take the time to watch them perform, they really are fantastic at what they do. If you’re impressed by them, give them some money or like their Facebook page! Talent like this needs supporting.