He's been around before, but never right outside.
It made my day (well, the working part of it at least!). There's something about accordians, they're just cool. Selling croissants at the same time, I felt a little bit French (pseudo-French anyway).
There was this one Dad who was with his heavily pregnant wife and kid in a pram who insisted on sitting on the bench opposite the accordian man for about 15 minutes, talking to him, and watching him in awe. It was pretty funny because I could only see the family and not the accordian man - the Dad entranced, sitting down, and his pregnant wife standing patiently (read 'come on, let's move on now!') by.
[note: not actually him. He may have looked similar though]