Only half the song
You've gotten off to the right start here - the animation's not exactly the best I've ever seen, but it's making good progress with the hamsters.
I'd say you really need to concentrate on the drawings of your band - zoom in closer, to give you greater control over the drawing implement and then you can come up with a neat basic outline. Look at the Madness series and see the faces - the cross is what you should use before putting the eyes on and you can use a similar horizontal line for the mouth. I'd give them a different colour than greay as well.
Since it's Weird Al, why not look for images of him and try to animate your own Al?
I'm really looking forward to seeing what this would look like if you finished the song :)
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