Supreme Villain Karthus

So I have been watching alot of classic animation movies, and I have always noticed (in my eyes) that the villains have some of the best singing parts. Being that Karthus is the Deathsigner, I think it would be freaking amazing if Karthus had a skin that he would singing like a classic villain during movements and abilities.

For example: @2:04 https://www.youtube.com/watch?v=Ocm8QdNR_d8 would be a perfect example of a Karthus ult

Or while in movement he sings something in the lines of "Be Prepared" https://www.youtube.com/watch?v=XkU23m6yX04

While taunting Annie or Bran he can sing something along the lines of "Hellfire" https://www.youtube.com/results?search_query=hellfire&spfreload=1

I think it would be a pretty amazing skin and probably one of the funniest when seen in action