Nice
I like the style and want to see more.
It was a bit short--my thought was that you were trying to end the animation at the end of a refrain of the music. I thought the transitions were a bit too quick. Half-way between a fade and a cut. It would have been better if you used just (longer) fades or you just cuts. Longer fades may have been more dramatic.
Also, in the case that you paced the animation to coincide with the music, what you could have done is allowed a dramatic pause to the music. For instance, have the music stop just before the coin starts flying through the air and start up again after he looks at it and reacts to it. Or, if that's too long of a pause, stop the music right after the coin lands in Macbeth's hand, then start it up again after he looks at it and reacts to it.
Just timing issues.