I must say I'm always too afraid of trying long exposures in photos whete there is people because I find perturbing not to know how it will turn, good or bad. But you did here a very nice job.
For me, I don't see any live music being played. As a new member to the site I'm taking the challenges literally (for now) - hence the lower score compared to other submitted photos.
Love the letterbox format, the motion blur, the great light, contrast between the blue of the sky and the greenish yellow of the lights and people's clothing.
Great use of the "wrong" white balance setting!
gets a 9 from me, actually, I'll even give you a ten.
i like the askwed-ness off the photo and the blur of the crowd. however even though a stage-like thing is present, it's unclear to me just what the source of music.