/playsound Doesn't Work At All

I tried typing "/playsound mob.enderdragon.end @a" in the chat menu, but it just says "Played sound 'mob.enderdragon.end' to Ethanicus," then does nothing. I've tried this with multiple different sounds but it doesn't work.
Yes, I've checked my sound settings and such, which are all working I've tried outside a resource pack and in one but it doesn't make a difference.