Ukulele Man

A few weeks ago, I spotted a man playing a ukulele on the corner of Waverly and Willoughby.  I couldn't tell if he was a Hasidic Jew or a hipster (or both!), but a small crowd of children and parents had gathered around and were excitedly singing along with him.  When I came by later, he was still there playing (sans audience). Sorry for the crap photo, but my hands were full and I only had my cell phone.

Anyone ever seen this dude??