Busking means performing in public for donations. The term can be applied to playing music, juggling, miming, rope-walking, magic, or any performance.
Here I am at the Saturday Market in Portland, Oregon, some time in the 1980s. It looks like Dan Compton's old fiddle case with a couple bucks in it. It was taken by a photographer named John, whose last name I can't recall. (John, are you around Ptown still?)