Nicely done.
I was personally impressed at the creativity of the lyrics you used for this rap battle and it all worked perfectly.
As for the animation itself, the way you drew the rap artists was good, but I do not understand why you decided to not flesh out the audience but just have shadows of them. Lastly, you have one of the rappers blink once, but then neither of them blink at all during the show (unless I myself am blind and missed it).
Good job.