Sometimes we feel uncomfortable taking random photographs of strangers on the streets.  A really easy way to get around your discomfort is to take a picture of a busker! They are performers and therefore are used to being watched and photographed.  

In the case of this gentleman, I watched and listened, and then asked him if I could photograph him while he performed. He graciously said, "of course" and I took several shots before placing some money in his open banjo case. It was a wholesome way of getting around my slight hesitation at street photography. "Asking" is a straightforward way to get your shot.