Being a musician, I like the focal point of the Barre chord. The blurred foreground and the tinted singer in the background set up the shot nicely. THe girls in the crowd, the beer bottle and the woodgrain guitar are nice details. Also. the light fixture, which oddly looks a lot like a living room fixture, looks like a planet in that black and blue "night sky" of a background.
People put up flashy sunsets and things in the free study and best of challenges, but its shots like these that make it interesting.
Took me a while to find the focus. My eyes are first drawn to the singer (because of your use of leading lines) and then moves to the part of the guitar that is closest to me.