Human voice vs. animal voice

I also like the crowing of ravens. Where I'm from, ravens mostly stay away from humans (as opposed to crows and mag pies) so when you hear a raven crow, it's a sign you're far away from humans and human activity, which to me is nice - nice that such places still exist.
Wait until you have one get used to you though. They're quite playful and think it's fun to wait until you're about to nod off in your hammock or you have your head under the hood of a car and startle you by crowing loudly.