I consider myself a harsh grader but I liked this
You have really nice eye expression and lip synching. The little devil guy REALLY added a lot.
It seems like the next step is to add just a little more detail in the animation (the conductor's motion was very repetative) and perhaps more detail in the background.
What causes many music video's to fail is the lack of interesting stuff going on and a lack of connection between the music and the visuals; you did these two things particularly well. Good job, I can't wait for more.