My girlfriend I witnessed a first recently. We heard a crow, slow, cackling, like a whale. It was like a human doing an exaggerated low vocal fry. When we visually figured out where it was coming from, we realized it was sitting on a limb, facing a much much larger hawk. This pretty substantially sized black bird was facing a hawk just squawking at it in a low hilarious way. It was soooo funny and awesome.

If you want to learn something, you do it. That's it. I have very little formal training and after wanting something bad enough, PLUS THE INTERNET now, you can figure anything out. "There's only 12 notes a man can play."