This is a nice shot. While candids can certainly be portraits I'm not sure this one fits (by my rules...which a are very loose). For me there needs to be some repose and maybe a little awareness of the camera or else it's a pure action shot.
Lovely portrait. Good angles. I also like just getting the second musician into the frame, just enough OOF so as not to distract from the main subject but yet add to the topic.
Very nice. I like the DOF, lighting, and composition. I'd like to see the whole face of the girl in the background, but the rest of the crop is very nice. 9
Another great take on the challenge, although your subject on the left detracts from your subject on the rights intensity and focus. Regardless, this is a fantastic portrait.