The singer is Matt Lewis, one of my favorite jazz musicians in Chicago. How cool is this guy, that he can just walk up to some street musicians in a foreign country and sound so good with them?!?!
Matt is often featured--as both a trumpeter and vocalist--with the Swing Shift Orchestra, the knock-your-socks-off big band that plays Thursdays at the Green Mill. I've been out on performance gigs with him many times, and the music he makes is always a pleasure to dance to--he's an amazing soloist and quite the showman as well. Oh and he swing dances too.
Here's Matt's website.