>>133
You might want to search for gypsy/tzigane/manouche music. There are plenty of styles but this music definitely made me think of that kind of music.
Stuff like this: http://www.youtube.com/watch?v=tnHlD0CHd-c
Oh, and look up the ost for Noir, by Yuki Kajuira.
Heh, where I live it's quite easy to wander the streets and have some people playing this way in the streets. They are often quite awesome.