Three things....
You CAN do your own addition of vocals. Just PRACTICE!
You drag the feel of the original with you in this piece.
Finally, Change up your lines, and give some flare...oh, and one more thing...there's some small clipping every now and then, but you have to listen carefully to catch it. Still, not a bad cover at all. If you can come up with some great lyrics of your own, this would be an epic piece to listen to again.