So I talked to my sister this morning about how the "performance" went with my nephew. Apparently Ben just stuck to the harmonica. Phew. He said it went great. At least he didn't attempt the piano as we wondered what in the world would happen with that... He did say that he messed up playing the harmonica but just started up again.
So there you go. Oh, to be 10 again and to have such confidence...though I question even in my younger years that I had that much confidence.