To be frank...epic win. My favorite part about this is the emote's hair. It looks just like Astley's, and the expression is priceless. It's kind of a shame dA deleted the first version, but your singing ties it all together, especially with the glitches in the recording. Anyway, I think it's cool on your part to bring back this old meme, considering it's going out of style these days.
My only critique is that the background is blank, and it would look better if it was behind something. Maybe something that looks roughly like the background for the music video, just in pixels?
Good sir, you've got to do more stuff like this. This completely made my day, and I can't wait to spread it around the internet to my friends.

This..this is a true work of art. This is what deviantART is! Pure originality, expression and feeling all in one piece of art. I just died went to heaven and came back to life and died again and went to Purgatory. All the movements, animations smooth and well made! I wanna cry. D: Artists need to take from this example of beauty and turn it into something of they're own! Please make more! D: I wanna see more! I am so jealous of your talents and awesomeness. You should teach others your way of leoleonardo artistic ways of epic-ness and godlynesscity. ;-;