It's fine.
Yeah, okay. If you are going to make a parody, just know that they are making them different.
But that doesn't mean to have bad voice actors. I'd say go to the internet and find someone on the internet to do the voice acting for you.
Also, the animation is only okay.
The background is fine, but static. Make it dynamic, make it have to do with what they are doing, maybe make one running while singing. The other out in the stands.
And if its a background singer, don't make them as loud as they are.
ooh, and make a replay button. I had to listen to this like 80 times while writing the review, and it gets kind of annoying.