Karthus and his ulti quotes

Nothing big, but I thought that it would be cool if what Karthus yells while casting his ultimate would be heard by everyone being affected, or maybe everyone on map, just like when Sion or Rek'Sai ults. That wouldn't make a difference like it would alert you that Requiem is being casted or something since there's low probability that you won't notice it, and it would be quite badass I guess. Apart from waiting few seconds for certain death, hearing e.g "Sing with your final breath!" would be nice. I don't know, what do you think? (english isn't my native language, grammar nazis please spare me)