The biggest issue we had was that there was a seeming underlying message to lie. The premise of the show is that the new music teacher doesn't have her supplies yet so the characters worked to surprise her with everyday music like stomping feet. We do not like the idea of lying, even if it is for a surprise. My husband and I both felt that it was encouraging children to keep secrets and lie.
My husband and I were disappointed by the concert overall. There was a heavy focus on the human singer (with a screechy nasal voice) and cookie monster made a short appearance for one song. The vendors provided churros, cotton candy, kettle corn and snow cones as snacks, which we were not thrilled with.
That said, our 2 year old and 5 month old were transfixed by the characters and music and were still for the whole concert ... except when my son was dancing.